diff --git a/modules/openapi-generator/src/main/resources/kotlin-client/api_doc.mustache b/modules/openapi-generator/src/main/resources/kotlin-client/api_doc.mustache
index a997cafd1621..d8dcd68632cc 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-client/api_doc.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/api_doc.mustache
@@ -68,18 +68,42 @@ Configure {{name}}:
 {{/isApiKey}}
 {{#isBasic}}
 {{#isBasicBasic}}
-Configure {{name}}:
-    ApiClient.username = ""
-    ApiClient.password = ""
+Configure {{name}} statically:
+```kotlin
+ApiClient.username = ""
+ApiClient.password = ""
+```
+{{#jvm-okhttp}}
+Configure {{name}} dynamically:
+```kotlin
+apiInstance.userCredentialProvider = { "user" to "pass" }
+```
+{{/jvm-okhttp}}
 {{/isBasicBasic}}
 {{#isBasicBearer}}
-Configure {{name}}:
-    ApiClient.accessToken = ""
+Configure {{name}} statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+{{#jvm-okhttp}}
+Configure {{name}} dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
+{{/jvm-okhttp}}
 {{/isBasicBearer}}
 {{/isBasic}}
 {{#isOAuth}}
-Configure {{name}}:
-    ApiClient.accessToken = ""
+Configure {{name}} statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+{{#jvm-okhttp}}
+Configure {{name}} dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
+{{/jvm-okhttp}}
 {{/isOAuth}}
 {{/authMethods}}
 
@@ -89,4 +113,4 @@ Configure {{name}}:
  - **Accept**: {{#produces}}{{{mediaType}}}{{^-last}}, {{/-last}}{{/produces}}{{^produces}}Not defined{{/produces}}
 
 {{/operation}}
-{{/operations}}
\ No newline at end of file
+{{/operations}}
diff --git a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-okhttp/infrastructure/ApiClient.kt.mustache b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-okhttp/infrastructure/ApiClient.kt.mustache
index 3dd83f71487a..c657675bb99c 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-okhttp/infrastructure/ApiClient.kt.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-okhttp/infrastructure/ApiClient.kt.mustache
@@ -148,6 +148,9 @@ import com.squareup.moshi.adapter
         {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -460,25 +463,26 @@ import com.squareup.moshi.adapter
         {{#isBasic}}
         {{#isBasicBasic}}
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            username?.let { username ->
-                password?.let { password ->
-                    requestConfig.headers[AUTHORIZATION] = okhttp3.Credentials.basic(username, password)
+            val (user, passw) = userCredentialsProvider()
+            user?.let { user ->
+                passw?.let { passw ->
+                    requestConfig.headers[AUTHORIZATION] = okhttp3.Credentials.basic(user, passw)
                 }
             }
         }
         {{/isBasicBasic}}
         {{#isBasicBearer}}
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken"
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token"
             }
         }
         {{/isBasicBearer}}
         {{/isBasic}}
         {{#isOAuth}}
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken "
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token "
             }
         }
         {{/isOAuth}}
diff --git a/samples/client/echo_api/kotlin-jvm-okhttp/docs/AuthApi.md b/samples/client/echo_api/kotlin-jvm-okhttp/docs/AuthApi.md
index 2614b18e353a..df299d51a1a2 100644
--- a/samples/client/echo_api/kotlin-jvm-okhttp/docs/AuthApi.md
+++ b/samples/client/echo_api/kotlin-jvm-okhttp/docs/AuthApi.md
@@ -45,9 +45,15 @@ This endpoint does not need any parameter.
 ### Authorization
 
 
-Configure http_auth:
-    ApiClient.username = ""
-    ApiClient.password = ""
+Configure http_auth statically:
+```kotlin
+ApiClient.username = ""
+ApiClient.password = ""
+```
+Configure http_auth dynamically:
+```kotlin
+apiInstance.userCredentialProvider = { "user" to "pass" }
+```
 
 ### HTTP request headers
 
@@ -91,8 +97,14 @@ This endpoint does not need any parameter.
 ### Authorization
 
 
-Configure http_bearer_auth:
-    ApiClient.accessToken = ""
+Configure http_bearer_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure http_bearer_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/echo_api/kotlin-jvm-okhttp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/echo_api/kotlin-jvm-okhttp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 75def196d6e1..d678c810e35f 100644
--- a/samples/client/echo_api/kotlin-jvm-okhttp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/echo_api/kotlin-jvm-okhttp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -357,15 +360,16 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            username?.let { username ->
-                password?.let { password ->
-                    requestConfig.headers[AUTHORIZATION] = okhttp3.Credentials.basic(username, password)
+            val (user, passw) = userCredentialsProvider()
+            user?.let { user ->
+                passw?.let { passw ->
+                    requestConfig.headers[AUTHORIZATION] = okhttp3.Credentials.basic(user, passw)
                 }
             }
         }
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken"
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token"
             }
         }
     }
diff --git a/samples/client/echo_api/kotlin-jvm-spring-3-restclient/docs/AuthApi.md b/samples/client/echo_api/kotlin-jvm-spring-3-restclient/docs/AuthApi.md
index 2614b18e353a..185917cb7c25 100644
--- a/samples/client/echo_api/kotlin-jvm-spring-3-restclient/docs/AuthApi.md
+++ b/samples/client/echo_api/kotlin-jvm-spring-3-restclient/docs/AuthApi.md
@@ -45,9 +45,11 @@ This endpoint does not need any parameter.
 ### Authorization
 
 
-Configure http_auth:
-    ApiClient.username = ""
-    ApiClient.password = ""
+Configure http_auth statically:
+```kotlin
+ApiClient.username = ""
+ApiClient.password = ""
+```
 
 ### HTTP request headers
 
@@ -91,8 +93,10 @@ This endpoint does not need any parameter.
 ### Authorization
 
 
-Configure http_bearer_auth:
-    ApiClient.accessToken = ""
+Configure http_bearer_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/echo_api/kotlin-jvm-spring-3-webclient/docs/AuthApi.md b/samples/client/echo_api/kotlin-jvm-spring-3-webclient/docs/AuthApi.md
index 2614b18e353a..185917cb7c25 100644
--- a/samples/client/echo_api/kotlin-jvm-spring-3-webclient/docs/AuthApi.md
+++ b/samples/client/echo_api/kotlin-jvm-spring-3-webclient/docs/AuthApi.md
@@ -45,9 +45,11 @@ This endpoint does not need any parameter.
 ### Authorization
 
 
-Configure http_auth:
-    ApiClient.username = ""
-    ApiClient.password = ""
+Configure http_auth statically:
+```kotlin
+ApiClient.username = ""
+ApiClient.password = ""
+```
 
 ### HTTP request headers
 
@@ -91,8 +93,10 @@ This endpoint does not need any parameter.
 ### Authorization
 
 
-Configure http_bearer_auth:
-    ApiClient.accessToken = ""
+Configure http_bearer_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/others/kotlin-integer-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/others/kotlin-integer-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 0197390a824a..88bc9ba0a7e3 100644
--- a/samples/client/others/kotlin-integer-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/others/kotlin-integer-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
diff --git a/samples/client/others/kotlin-jvm-okhttp-non-ascii-headers/docs/PetApi.md b/samples/client/others/kotlin-jvm-okhttp-non-ascii-headers/docs/PetApi.md
index e0bf879c9a65..38e8d3e890a5 100644
--- a/samples/client/others/kotlin-jvm-okhttp-non-ascii-headers/docs/PetApi.md
+++ b/samples/client/others/kotlin-jvm-okhttp-non-ascii-headers/docs/PetApi.md
@@ -54,8 +54,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -103,8 +109,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -151,8 +163,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -199,8 +217,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -296,8 +320,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -347,8 +377,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -399,8 +435,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/others/kotlin-jvm-okhttp-non-ascii-headers/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/others/kotlin-jvm-okhttp-non-ascii-headers/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 6ce203cc15e2..5debecf8c25b 100644
--- a/samples/client/others/kotlin-jvm-okhttp-non-ascii-headers/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/others/kotlin-jvm-okhttp-non-ascii-headers/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -357,8 +360,8 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken "
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token "
             }
         }
         if (requestConfig.headers["api_key"].isNullOrEmpty()) {
diff --git a/samples/client/others/kotlin-jvm-okhttp-parameter-tests/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/others/kotlin-jvm-okhttp-parameter-tests/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 0197390a824a..88bc9ba0a7e3 100644
--- a/samples/client/others/kotlin-jvm-okhttp-parameter-tests/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/others/kotlin-jvm-okhttp-parameter-tests/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
diff --git a/samples/client/others/kotlin-jvm-okhttp-path-comments/docs/StuffApi.md b/samples/client/others/kotlin-jvm-okhttp-path-comments/docs/StuffApi.md
index 5208c69e8d44..777d2a049b31 100644
--- a/samples/client/others/kotlin-jvm-okhttp-path-comments/docs/StuffApi.md
+++ b/samples/client/others/kotlin-jvm-okhttp-path-comments/docs/StuffApi.md
@@ -44,8 +44,14 @@ This endpoint does not need any parameter.
 ### Authorization
 
 
-Configure bearerAuth:
-    ApiClient.accessToken = ""
+Configure bearerAuth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure bearerAuth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/others/kotlin-jvm-okhttp-path-comments/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/others/kotlin-jvm-okhttp-path-comments/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 9c0e379663b8..93bef21acd1a 100644
--- a/samples/client/others/kotlin-jvm-okhttp-path-comments/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/others/kotlin-jvm-okhttp-path-comments/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -357,8 +360,8 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken"
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token"
             }
         }
     }
diff --git a/samples/client/petstore/kotlin-allOf-discriminator-kotlinx-serialization/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-allOf-discriminator-kotlinx-serialization/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 5ae765ef16bd..b28f0b001886 100644
--- a/samples/client/petstore/kotlin-allOf-discriminator-kotlinx-serialization/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-allOf-discriminator-kotlinx-serialization/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -120,6 +120,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
diff --git a/samples/client/petstore/kotlin-allOf-discriminator/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-allOf-discriminator/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 0197390a824a..88bc9ba0a7e3 100644
--- a/samples/client/petstore/kotlin-allOf-discriminator/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-allOf-discriminator/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
diff --git a/samples/client/petstore/kotlin-array-integer-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-array-integer-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 0197390a824a..88bc9ba0a7e3 100644
--- a/samples/client/petstore/kotlin-array-integer-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-array-integer-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
diff --git a/samples/client/petstore/kotlin-array-nullable-items/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-array-nullable-items/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 0197390a824a..88bc9ba0a7e3 100644
--- a/samples/client/petstore/kotlin-array-nullable-items/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-array-nullable-items/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
diff --git a/samples/client/petstore/kotlin-array-simple-string-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-array-simple-string-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 0197390a824a..88bc9ba0a7e3 100644
--- a/samples/client/petstore/kotlin-array-simple-string-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-array-simple-string-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
diff --git a/samples/client/petstore/kotlin-bigdecimal-default-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-bigdecimal-default-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 0197390a824a..88bc9ba0a7e3 100644
--- a/samples/client/petstore/kotlin-bigdecimal-default-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-bigdecimal-default-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
diff --git a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 0197390a824a..88bc9ba0a7e3 100644
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
diff --git a/samples/client/petstore/kotlin-enum-default-value/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-enum-default-value/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 0197390a824a..88bc9ba0a7e3 100644
--- a/samples/client/petstore/kotlin-enum-default-value/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-enum-default-value/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
diff --git a/samples/client/petstore/kotlin-explicit/docs/PetApi.md b/samples/client/petstore/kotlin-explicit/docs/PetApi.md
index 6856ea516dab..630fc891638b 100644
--- a/samples/client/petstore/kotlin-explicit/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-explicit/docs/PetApi.md
@@ -51,8 +51,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -98,8 +104,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -146,8 +158,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -194,8 +212,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -288,8 +312,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -337,8 +367,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -387,8 +423,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-explicit/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-explicit/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 8dde76474b55..b77ffdbfb22e 100644
--- a/samples/client/petstore/kotlin-explicit/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-explicit/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ public open class ApiClient(public val baseUrl: String, public val client: Call.
         public val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    public var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    public var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -357,8 +360,8 @@ public open class ApiClient(public val baseUrl: String, public val client: Call.
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken "
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token "
             }
         }
         if (requestConfig.headers["api_key"].isNullOrEmpty()) {
diff --git a/samples/client/petstore/kotlin-gson/docs/PetApi.md b/samples/client/petstore/kotlin-gson/docs/PetApi.md
index e0bf879c9a65..38e8d3e890a5 100644
--- a/samples/client/petstore/kotlin-gson/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-gson/docs/PetApi.md
@@ -54,8 +54,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -103,8 +109,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -151,8 +163,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -199,8 +217,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -296,8 +320,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -347,8 +377,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -399,8 +435,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index d6f907f7947c..0be2f0b3bd69 100644
--- a/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -356,8 +359,8 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken "
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token "
             }
         }
         if (requestConfig.headers["api_key"].isNullOrEmpty()) {
diff --git a/samples/client/petstore/kotlin-jackson/docs/PetApi.md b/samples/client/petstore/kotlin-jackson/docs/PetApi.md
index 6856ea516dab..630fc891638b 100644
--- a/samples/client/petstore/kotlin-jackson/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-jackson/docs/PetApi.md
@@ -51,8 +51,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -98,8 +104,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -146,8 +158,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -194,8 +212,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -288,8 +312,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -337,8 +367,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -387,8 +423,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 18912784874d..2abbb30eb798 100644
--- a/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -356,8 +359,8 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken "
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token "
             }
         }
         if (requestConfig.headers["api_key"].isNullOrEmpty()) {
diff --git a/samples/client/petstore/kotlin-json-request-string/docs/PetApi.md b/samples/client/petstore/kotlin-json-request-string/docs/PetApi.md
index 318ca7c9e1e9..3bebda4ecd49 100644
--- a/samples/client/petstore/kotlin-json-request-string/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-json-request-string/docs/PetApi.md
@@ -51,8 +51,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -98,8 +104,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -146,8 +158,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -192,8 +210,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -286,8 +310,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -335,8 +365,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -385,8 +421,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 44ee00b60b08..c4289daa1493 100644
--- a/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -121,6 +121,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -364,8 +367,8 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken "
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token "
             }
         }
         if (requestConfig.headers["api_key"].isNullOrEmpty()) {
diff --git a/samples/client/petstore/kotlin-jvm-ktor-gson/docs/FakeApi.md b/samples/client/petstore/kotlin-jvm-ktor-gson/docs/FakeApi.md
index 5d6e47a6f2b3..c3412b1b0015 100644
--- a/samples/client/petstore/kotlin-jvm-ktor-gson/docs/FakeApi.md
+++ b/samples/client/petstore/kotlin-jvm-ktor-gson/docs/FakeApi.md
@@ -96,8 +96,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-jvm-ktor-gson/docs/PetApi.md b/samples/client/petstore/kotlin-jvm-ktor-gson/docs/PetApi.md
index 0a13a8fa8ce3..b75318d1bc72 100644
--- a/samples/client/petstore/kotlin-jvm-ktor-gson/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-jvm-ktor-gson/docs/PetApi.md
@@ -54,8 +54,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -103,8 +105,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -151,8 +155,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -199,8 +205,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -296,8 +304,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -347,8 +357,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -399,8 +411,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-jvm-ktor-jackson/docs/PetApi.md b/samples/client/petstore/kotlin-jvm-ktor-jackson/docs/PetApi.md
index 0b928e328e60..bf941538de6c 100644
--- a/samples/client/petstore/kotlin-jvm-ktor-jackson/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-jvm-ktor-jackson/docs/PetApi.md
@@ -51,8 +51,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -98,8 +100,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -146,8 +150,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -194,8 +200,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -288,8 +296,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -337,8 +347,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -387,8 +399,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-jvm-ktor-kotlinx_serialization/docs/PetApi.md b/samples/client/petstore/kotlin-jvm-ktor-kotlinx_serialization/docs/PetApi.md
index 0a13a8fa8ce3..b75318d1bc72 100644
--- a/samples/client/petstore/kotlin-jvm-ktor-kotlinx_serialization/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-jvm-ktor-kotlinx_serialization/docs/PetApi.md
@@ -54,8 +54,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -103,8 +105,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -151,8 +155,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -199,8 +205,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -296,8 +304,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -347,8 +357,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -399,8 +411,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/docs/PetApi.md b/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/docs/PetApi.md
index 6856ea516dab..630fc891638b 100644
--- a/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/docs/PetApi.md
@@ -51,8 +51,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -98,8 +104,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -146,8 +158,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -194,8 +212,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -288,8 +312,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -337,8 +367,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -387,8 +423,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index f4b11927a365..9ec489f5ae54 100644
--- a/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-jvm-okhttp4-coroutines/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -122,6 +122,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -359,8 +362,8 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken "
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token "
             }
         }
         if (requestConfig.headers["api_key"].isNullOrEmpty()) {
diff --git a/samples/client/petstore/kotlin-jvm-spring-2-webclient/docs/PetApi.md b/samples/client/petstore/kotlin-jvm-spring-2-webclient/docs/PetApi.md
index 9eb15f0e7013..c185d4179761 100644
--- a/samples/client/petstore/kotlin-jvm-spring-2-webclient/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-jvm-spring-2-webclient/docs/PetApi.md
@@ -54,8 +54,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -103,8 +105,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -151,8 +155,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -199,8 +205,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -296,8 +304,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -347,8 +357,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -399,8 +411,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-jvm-spring-3-restclient/docs/PetApi.md b/samples/client/petstore/kotlin-jvm-spring-3-restclient/docs/PetApi.md
index 9eb15f0e7013..c185d4179761 100644
--- a/samples/client/petstore/kotlin-jvm-spring-3-restclient/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-jvm-spring-3-restclient/docs/PetApi.md
@@ -54,8 +54,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -103,8 +105,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -151,8 +155,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -199,8 +205,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -296,8 +304,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -347,8 +357,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -399,8 +411,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-jvm-spring-3-webclient/docs/PetApi.md b/samples/client/petstore/kotlin-jvm-spring-3-webclient/docs/PetApi.md
index 9eb15f0e7013..c185d4179761 100644
--- a/samples/client/petstore/kotlin-jvm-spring-3-webclient/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-jvm-spring-3-webclient/docs/PetApi.md
@@ -54,8 +54,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -103,8 +105,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -151,8 +155,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -199,8 +205,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -296,8 +304,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -347,8 +357,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -399,8 +411,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-jvm-vertx-gson/docs/PetApi.md b/samples/client/petstore/kotlin-jvm-vertx-gson/docs/PetApi.md
index 9eb15f0e7013..c185d4179761 100644
--- a/samples/client/petstore/kotlin-jvm-vertx-gson/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-jvm-vertx-gson/docs/PetApi.md
@@ -54,8 +54,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -103,8 +105,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -151,8 +155,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -199,8 +205,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -296,8 +304,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -347,8 +357,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -399,8 +411,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-jvm-vertx-jackson-coroutines/docs/PetApi.md b/samples/client/petstore/kotlin-jvm-vertx-jackson-coroutines/docs/PetApi.md
index 9eb15f0e7013..c185d4179761 100644
--- a/samples/client/petstore/kotlin-jvm-vertx-jackson-coroutines/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-jvm-vertx-jackson-coroutines/docs/PetApi.md
@@ -54,8 +54,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -103,8 +105,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -151,8 +155,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -199,8 +205,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -296,8 +304,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -347,8 +357,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -399,8 +411,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-jvm-vertx-jackson/docs/PetApi.md b/samples/client/petstore/kotlin-jvm-vertx-jackson/docs/PetApi.md
index 9eb15f0e7013..c185d4179761 100644
--- a/samples/client/petstore/kotlin-jvm-vertx-jackson/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-jvm-vertx-jackson/docs/PetApi.md
@@ -54,8 +54,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -103,8 +105,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -151,8 +155,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -199,8 +205,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -296,8 +304,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -347,8 +357,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -399,8 +411,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-jvm-vertx-moshi/docs/PetApi.md b/samples/client/petstore/kotlin-jvm-vertx-moshi/docs/PetApi.md
index 9eb15f0e7013..c185d4179761 100644
--- a/samples/client/petstore/kotlin-jvm-vertx-moshi/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-jvm-vertx-moshi/docs/PetApi.md
@@ -54,8 +54,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -103,8 +105,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -151,8 +155,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -199,8 +205,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -296,8 +304,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -347,8 +357,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -399,8 +411,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-kotlinx-datetime/docs/PetApi.md b/samples/client/petstore/kotlin-kotlinx-datetime/docs/PetApi.md
index 6856ea516dab..630fc891638b 100644
--- a/samples/client/petstore/kotlin-kotlinx-datetime/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-kotlinx-datetime/docs/PetApi.md
@@ -51,8 +51,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -98,8 +104,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -146,8 +158,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -194,8 +212,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -288,8 +312,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -337,8 +367,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -387,8 +423,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-kotlinx-datetime/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-kotlinx-datetime/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 3f8f02e86937..55f11cac9d72 100644
--- a/samples/client/petstore/kotlin-kotlinx-datetime/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-kotlinx-datetime/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -357,8 +360,8 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken "
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token "
             }
         }
         if (requestConfig.headers["api_key"].isNullOrEmpty()) {
diff --git a/samples/client/petstore/kotlin-modelMutable/docs/PetApi.md b/samples/client/petstore/kotlin-modelMutable/docs/PetApi.md
index e385754514fb..1867aec4a0bc 100644
--- a/samples/client/petstore/kotlin-modelMutable/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-modelMutable/docs/PetApi.md
@@ -51,8 +51,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -98,8 +104,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -146,8 +158,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -194,8 +212,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -288,8 +312,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -337,8 +367,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -387,8 +423,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-modelMutable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-modelMutable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 3f8f02e86937..55f11cac9d72 100644
--- a/samples/client/petstore/kotlin-modelMutable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-modelMutable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -357,8 +360,8 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken "
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token "
             }
         }
         if (requestConfig.headers["api_key"].isNullOrEmpty()) {
diff --git a/samples/client/petstore/kotlin-moshi-codegen/docs/PetApi.md b/samples/client/petstore/kotlin-moshi-codegen/docs/PetApi.md
index 6856ea516dab..630fc891638b 100644
--- a/samples/client/petstore/kotlin-moshi-codegen/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-moshi-codegen/docs/PetApi.md
@@ -51,8 +51,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -98,8 +104,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -146,8 +158,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -194,8 +212,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -288,8 +312,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -337,8 +367,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -387,8 +423,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 3f8f02e86937..55f11cac9d72 100644
--- a/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -357,8 +360,8 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken "
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token "
             }
         }
         if (requestConfig.headers["api_key"].isNullOrEmpty()) {
diff --git a/samples/client/petstore/kotlin-multiplatform-kotlinx-datetime/docs/PetApi.md b/samples/client/petstore/kotlin-multiplatform-kotlinx-datetime/docs/PetApi.md
index 0b928e328e60..bf941538de6c 100644
--- a/samples/client/petstore/kotlin-multiplatform-kotlinx-datetime/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-multiplatform-kotlinx-datetime/docs/PetApi.md
@@ -51,8 +51,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -98,8 +100,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -146,8 +150,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -194,8 +200,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -288,8 +296,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -337,8 +347,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -387,8 +399,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-multiplatform/docs/PetApi.md b/samples/client/petstore/kotlin-multiplatform/docs/PetApi.md
index 0b928e328e60..bf941538de6c 100644
--- a/samples/client/petstore/kotlin-multiplatform/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-multiplatform/docs/PetApi.md
@@ -51,8 +51,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -98,8 +100,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -146,8 +150,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -194,8 +200,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -288,8 +296,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -337,8 +347,10 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
@@ -387,8 +399,10 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-name-parameter-mappings/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-name-parameter-mappings/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 0197390a824a..88bc9ba0a7e3 100644
--- a/samples/client/petstore/kotlin-name-parameter-mappings/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-name-parameter-mappings/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
diff --git a/samples/client/petstore/kotlin-nonpublic/docs/PetApi.md b/samples/client/petstore/kotlin-nonpublic/docs/PetApi.md
index 6856ea516dab..630fc891638b 100644
--- a/samples/client/petstore/kotlin-nonpublic/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-nonpublic/docs/PetApi.md
@@ -51,8 +51,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -98,8 +104,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -146,8 +158,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -194,8 +212,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -288,8 +312,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -337,8 +367,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -387,8 +423,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index aff54eb43a1b..eb0c4fa8d3f0 100644
--- a/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ internal open class ApiClient(val baseUrl: String, val client: Call.Factory = de
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -357,8 +360,8 @@ internal open class ApiClient(val baseUrl: String, val client: Call.Factory = de
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken "
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token "
             }
         }
         if (requestConfig.headers["api_key"].isNullOrEmpty()) {
diff --git a/samples/client/petstore/kotlin-nullable/docs/PetApi.md b/samples/client/petstore/kotlin-nullable/docs/PetApi.md
index c34fce5f4a46..5ca7d71d8184 100644
--- a/samples/client/petstore/kotlin-nullable/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-nullable/docs/PetApi.md
@@ -51,8 +51,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -98,8 +104,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -146,8 +158,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -194,8 +212,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -288,8 +312,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -337,8 +367,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -387,8 +423,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 3f8f02e86937..55f11cac9d72 100644
--- a/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -357,8 +360,8 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken "
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token "
             }
         }
         if (requestConfig.headers["api_key"].isNullOrEmpty()) {
diff --git a/samples/client/petstore/kotlin-string/docs/PetApi.md b/samples/client/petstore/kotlin-string/docs/PetApi.md
index ea42a0d82f60..2fd292cbf9e0 100644
--- a/samples/client/petstore/kotlin-string/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-string/docs/PetApi.md
@@ -51,8 +51,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -98,8 +104,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -146,8 +158,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -194,8 +212,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -288,8 +312,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -337,8 +367,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -387,8 +423,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 3f8f02e86937..55f11cac9d72 100644
--- a/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -357,8 +360,8 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken "
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token "
             }
         }
         if (requestConfig.headers["api_key"].isNullOrEmpty()) {
diff --git a/samples/client/petstore/kotlin-threetenbp/docs/PetApi.md b/samples/client/petstore/kotlin-threetenbp/docs/PetApi.md
index 6856ea516dab..630fc891638b 100644
--- a/samples/client/petstore/kotlin-threetenbp/docs/PetApi.md
+++ b/samples/client/petstore/kotlin-threetenbp/docs/PetApi.md
@@ -51,8 +51,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -98,8 +104,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -146,8 +158,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -194,8 +212,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -288,8 +312,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -337,8 +367,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -387,8 +423,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 8f316e316b2e..ef9cb9e15418 100644
--- a/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -357,8 +360,8 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken "
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token "
             }
         }
         if (requestConfig.headers["api_key"].isNullOrEmpty()) {
diff --git a/samples/client/petstore/kotlin-uppercase-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-uppercase-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 5ae765ef16bd..b28f0b001886 100644
--- a/samples/client/petstore/kotlin-uppercase-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-uppercase-enum/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -120,6 +120,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
diff --git a/samples/client/petstore/kotlin/docs/PetApi.md b/samples/client/petstore/kotlin/docs/PetApi.md
index 6856ea516dab..630fc891638b 100644
--- a/samples/client/petstore/kotlin/docs/PetApi.md
+++ b/samples/client/petstore/kotlin/docs/PetApi.md
@@ -51,8 +51,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -98,8 +104,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -146,8 +158,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -194,8 +212,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -288,8 +312,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -337,8 +367,14 @@ null (empty response body)
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
@@ -387,8 +423,14 @@ try {
 ### Authorization
 
 
-Configure petstore_auth:
-    ApiClient.accessToken = ""
+Configure petstore_auth statically:
+```kotlin
+ApiClient.accessToken = ""
+```
+Configure petstore_auth dynamically:
+```kotlin
+apiInstance.accessTokenProvider = { "" }
+```
 
 ### HTTP request headers
 
diff --git a/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index 3f8f02e86937..55f11cac9d72 100644
--- a/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -119,6 +119,9 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
         val builder: OkHttpClient.Builder = OkHttpClient.Builder()
     }
 
+    var userCredentialsProvider: () -> Pair<String?, String?> = { username to password }
+    var accessTokenProvider: () -> String? = { accessToken }
+
     /**
      * Guess Content-Type header from the given byteArray (defaults to "application/octet-stream").
      *
@@ -357,8 +360,8 @@ open class ApiClient(val baseUrl: String, val client: Call.Factory = defaultClie
 
     protected fun <T> updateAuthParams(requestConfig: RequestConfig<T>) {
         if (requestConfig.headers[AUTHORIZATION].isNullOrEmpty()) {
-            accessToken?.let { accessToken ->
-                requestConfig.headers[AUTHORIZATION] = "Bearer $accessToken "
+            accessTokenProvider()?.let { token ->
+                requestConfig.headers[AUTHORIZATION] = "Bearer $token "
             }
         }
         if (requestConfig.headers["api_key"].isNullOrEmpty()) {