```java
public static void changeApiKey(@NonNull String newApiKey)
```
```kotlin
fun changeApiKey(@NonNull newApiKey:String)
```
**Parameters:**
| Parameter | Type | Mandatory | Default | Description |
| --- | --- | --- | --- | --- |
| **newApiKey** | String | yes | - | New API Key |
**Return Value:**
Void type method.
**Example:**
```java
Client.changeApiKey(apiKey);
```
```kotlin
Client.changeApiKey(apiKey);
```
## Change Profile API Key dynamically with config
---
This method changes a Profile (formerly Client) API key dynamically, with additional parameters. It can include a salt for [Simple Profile Authentication](/developers/mobile-sdk/user-identification-and-authorization/simple-authentication) requests.
| | **iOS SDK** | **Android SDK** | **React Native SDK** | **Flutter SDK** |
| --- | --- | --- | --- | --- |
|
```java
public static void changeApiKey(String apiKey, InitializationConfig initializationConfig)
```
```kotlin
fun changeApiKey(@NonNull apiKey:String, @Nullable initializationConfig:InitializationConfig)
```
**Parameters:**
| Parameter | Type | Mandatory | Default | Description |
| --- | --- | --- | --- | --- |
| **apiKey** | String | yes | - | New API Key |
| **initializationConfig** | [InitializationConfig](/developers/mobile-sdk/class-reference/android/lifecycle#initializationconfig) | no | - | Object for additional initialization settings after the API key change |
**Return Value:**
Void type method.
**Example:**
```java
Client.changeApiKey(apiKey, initializationConfig);
```
```kotlin
Client.changeApiKey(apiKey, initializationConfig);
```