## Refresh customer token --- This method refreshes the customer’s current token.
Returns an error if the token has expired and cannot be refreshed.
**Method name:** Client.refreshToken() **Declaration:**
```Java public static IApiCall refreshToken() ```
```Kotlin fun refreshToken():IApiCall ```
**Parameters:** No parameters required. **Return Value:** [IApiCall](/developers/mobile-sdk/method-reference/android/public-interfaces#iapicall) object to execute the request. **Example:**
```Java boolean success = Client.refreshToken(); ```
```Kotlin var success = Client.refreshToken() ```
## Retrieve customer token --- This method retrieves the customer’s current, active token.
Returns an error if the token has expired and cannot be retrieved.
**Method name:** Client.retrieveToken()
This method replaces `Client.getToken()`.
**Declaration:**
```Java public static IDataApiCall retrieveToken() ```
```Kotlin fun retrieveToken():IDataApiCall ```
**Parameters:** No parameters required. **Return Value:** [IDataApiCall](/developers/mobile-sdk/method-reference/android/public-interfaces#idataapicall)<[Token](/developers/mobile-sdk/class-reference/android/client#token)> object to execute the request. **Example:**
```Java IDataApiCall retrieveTokenCall = Client.retrieveToken(); retrieveTokenCall.execute(success -> onSuccess(), this::onFailure); ```
```Kotlin val retrieveTokenCall = Client.retrieveToken() retrieveTokenCall.execute({ success-> onSuccess() }, ({ this.onFailure() })) ```
## Get current customer UUID --- This method retrieves the customer’s current UUID. **Method name:** Client.getUuid() **Declaration:**
```Java public static String getUuid() ```
```Kotlin fun getUuid():String ```
**Parameters:** No parameters required. **Return Value:** Customer's UUID as a string. **Example:**
```Java Client.getUuid() ```
```Kotlin Client.getUuid() ```
## Get customer UUID for use in authentication --- This method retrieves the current UUID or generates a new one from a seed. | | **iOS SDK** | **Android SDK** | **React Native SDK** | **Flutter SDK** | | --- | --- | --- | --- | --- | | Introduced in: | 4.15.0 | 5.15.0 | n/a | n/a |
This operation doesn't affect the customer session in the SDK.
**Method name:** Client.getUuidForAuthentication() **Declaration:**
```Java public static String getUuidForAuthentication(@NonNull String authId) ```
```Kotlin fun getUuidForAuthentication( authId: String ): String ```
**Parameters:** | Parameter | Type | Mandatory | Default | Description | | --- | --- | --- | --- | --- | | **authId** | String | yes | --- | Seed for UUID generation | **Return Value:** The UUID for use in authentication as a string. **Example:**
```Java Client.getUuidForAuthentication(authId) ```
```Kotlin Client.getUuidForAuthentication(authId) ```
## Regenerate customer --- This method regenerates the UUID and clears the authentication token, login session, custom email, and custom identifier. This operation works only if the customer is anonymous. This operation clears the authentication token, login (if applicable), custom email, and custom identifier. | | **iOS SDK** | **Android SDK** | **React Native SDK** | **Flutter SDK** | | --- | --- | --- | --- | --- | | Introduced in: | 3.3.10 | 3.3.5 | 0.9.0 | 0.7.0 | **Method name:** Client.regenerateUuid() **Declaration:**
```Java public static boolean regenerateUuid() ```
```Kotlin fun regenerateUuid():Boolean ```
**Parameters:** No parameters required. **Return Value:** Returns true if the current Customer is anonymous and the operation succeeds. **Example:**
```Java boolean success = Client.regenerateUuid(); ```
```Kotlin var success = Client.regenerateUuid() ```
## Regenerate customer with identifier --- This method regenerates the UUID and clears the authentication token, login session, custom email, and custom identifier. This operation works only if the customer is anonymous. This operation clears the authentication token, login (if applicable), custom email, and custom identifier The optional `clientIdentifier` parameter is a seed for UUID generation. | | **iOS SDK** | **Android SDK** | **React Native SDK** | **Flutter SDK** | | --- | --- | --- | --- | --- | | Introduced in: | 3.6.5 | 3.6.4 | 0.9.10 | 0.7.2 | **Method name:** Client.regenerateUuid(clientIdentifier) **Declaration:**
```Java public static boolean regenerateUuid(clientIdentifier) ```
```Kotlin fun regenerateUuid(clientIdentifier):Boolean ```
**Parameters:** | Parameter | Type | Mandatory | Description | | --- | --- | --- | --- | | **clientIdentifier** | String | no | Seed for UUID generation |
The **clientIdentifier** parameter is used for decreasing the number of UUID refreshes, so it must be unique for every customer.
**Return Value:** Returns true if the current Client is anonymous and the operation succeeds. **Example:**
```Java boolean success = Client.regenerateUuid(clientIdentifier); ```
```Kotlin var success = Client.regenerateUuid(clientIdentifier) ```
## Destroy current session --- This method destroys the session completely. This method clears all session data (both client and anonymous) and removes cached data. Then, it regenerates the UUID and creates the new anonymous session. **Method name:** Client.destroySession() **Declaration:**
```Java public static void destroySession() ```
```Kotlin fun destroySession() ```
**Parameters:** No parameters required. **Return Value:** Method is void type. **Example:**
```Java Client.destroySession(); ```
```Kotlin Client.destroySession() ```