## Related terms
- mobile\-sdk
- api\-key
See the [glossary](/glossary.md) for definitions.
---
# SDK lifecycle
## Set Synerise delegate
---
This method sets an object for Synerise delegate methods.
**Declared In:**
Headers/SNRSynerise.h
**Related To:**
[SyneriseDelegate](/developers/mobile-sdk/listeners-and-delegates/ios-delegates#synerise-delegate)
**Class:**
Synerise
**Declaration:**
Swift Objective-C
```Swift
static func setDelegate(_ delegate: SyneriseDelegate)
```
```Objective-C
+ (void)setDelegate:(SNRSyneriseDelegate *)delegate
```
**Discussion:**
Learn more about the methods and the purpose of this listener [here](/developers/mobile-sdk/listeners-and-delegates/ios-delegates#synerise-delegate).
## Initialization
---
This method initializes Synerise.
This method must be called before any other Synerise SDK method and only once during the application's lifecycle.
Swift Objective-C
```Swift
static func initialize(apiKey: String) -> Void
```
```Objective-C
+ (void)initializeWithApiKey:(NSString *)apiKey
```
Before version 5.0.0, this method was called `Synerise.initialize(clientApiKey:)`.
Swift Objective-C
```Swift
let apiKey = "YOUR_PROFILE_API_KEY"
Synerise.initialize(apiKey: apiKey)
```
```Objective-C
static NSString *apiKey = @"YOUR_PROFILE_API_KEY";
[SNRSynerise initializeWithApiKey:apiKey];
```
## Initialize with custom environment
---
This method initializes Synerise SDK with custom environment settings.
This method must be called before any other Synerise SDK method and only once during the application's lifecycle.
Swift Objective-C
```Swift
static func initialize(apiKey: String, baseUrl: String?) -> Void
```
```Objective-C
+ (void)initializeWithApiKey:(NSString *)apiKey andBaseUrl:(nullable NSString *)baseUrl
```
Before version 5.0.0, this method was called `Synerise.initialize(clientApiKey:baseUrl:)`.
Swift Objective-C
**SyneriseApiUrls.SYNERISE_AZ_API_URL** - `https://api.snrapi.com`
**SyneriseApiUrls.SYNERISE_AZU_API_URL** - `https://api.azu.snrapi.com`
**SyneriseApiUrls.SYNERISE_GEB_API_URL** - `https://api.geb.snrapi.com`
**SNR_SYNERISE_AZ_API_URL** - `https://api.snrapi.com`
**SNR_SYNERISE_AZU_API_URL** - `https://api.azu.snrapi.com`
**SNR_SYNERISE_GEB_API_URL** - `https://api.geb.snrapi.com`
**Return Value:**
No value is returned.
**Example:**
Swift Objective-C
```Swift
let apiKey = "YOUR_PROFILE_API_KEY"
let apiBaseUrl = "YOUR_API_BASE_URL"
Synerise.initialize(apiKey: apiKey, baseUrl: apiBaseUrl)
```
```Objective-C
static NSString *apiKey = @"YOUR_PROFILE_API_KEY";
static NSString *apiBaseUrl = @"YOUR_API_BASE_URL";
[SNRSynerise initializeWithApiKey:apiKey andBaseUrl:apiBaseUrl];
```
## Change Profile API Key dynamically
---
This method changes a Profile (formerly Client) API key dynamically.
**Declared In:**
Headers/SNRSynerise.h
**Class:**
[Synerise](/developers/mobile-sdk/class-reference/ios/modules#synerise)
**Declaration:**
Swift Objective-C
```Swift
static func changeApiKey(_ apiKey: String) -> Void
```
```Objective-C
+ (void)changeApiKey:(nonnull NSString *)apiKey
```
Before version 5.0.0, this method was called `Synerise.changeClientApiKey(_ clientApiKey:)`.
Introduced in: | 4.19.0 | 5.20.0 | 0.23.0 | 1.3.0 |
**Declared In:**
Headers/SNRSynerise.h
**Class:**
[Synerise](/developers/mobile-sdk/class-reference/ios/modules#synerise)
**Declaration:**
Swift Objective-C
```Swift
static func changeApiKey(_ apiKey: String, config: InitializationConfig?) -> Void
```
```Objective-C
+ (void)changeApiKey:(nonnull NSString *)apiKey config:(nullable SNRInitializationConfig *)config;
```
Before version 5.0.0, this method was called `Synerise.changeClientApiKey(_ clientApiKey:config:)`.
Introduced in: | 4.14.0 | 5.7.1 | 0.15.0 | 0.7.0 |
**Declared In:**
Headers/SNRSynerise.h
**Class:**
[Synerise](/developers/mobile-sdk/class-reference/ios/modules#synerise)
**Declaration:**
Swift Objective-C
```Swift
static func setRequestValidationSalt(_: String?) -> Void
```
```Objective-C
+ (void)setRequestValidationSalt:(nullable NSString *)string
```
**Parameters:**
| Parameter | Type | Mandatory | Default | Description |
| --- | --- | --- | --- | --- |
| **salt** | String | no | - | Synerise Profile salt string for request validation |
**Return Value:**
No value is returned.
## Set up host application type
---
This method sets the Synerise SDK host application type.
| | **iOS SDK** | **Android SDK** | **React Native SDK** | **Flutter SDK** |
| --- | --- | --- | --- | --- |
| Introduced in: | 3.6.1 | 3.6.22 | - | - |
**Declared In:**
Headers/SNRSynerise.h
**Class:**
[Synerise](/developers/mobile-sdk/class-reference/ios/modules#synerise)
**Declaration:**
Swift Objective-C
```Swift
static func setHostApplicationType(_ type: HostApplicationType) -> Void
```
```Objective-C
+ (void)setHostApplicationType:(SNRHostApplicationType)type
```
**Parameters:**
| Parameter | Type | Mandatory | Default | Description |
| --- | --- | --- | --- | --- |
| **type** | [HostApplicationType](/developers/mobile-sdk/class-reference/ios/miscellaneous#hostapplicationtype) | yes | - | Specifies the type of host application |
**Return Value:**
No value is returned.
## Set host application SDK plugin version
---
This method sets the Synerise SDK plugin version.
| | **iOS SDK** | **Android SDK** | **React Native SDK** | **Flutter SDK** |
| --- | --- | --- | --- | --- |
| Introduced in: | 4.14.6 | 5.11.0 | - | - |
**Declared In:**
Headers/SNRSynerise.h
**Class:**
[Synerise](/developers/mobile-sdk/class-reference/ios/modules#synerise)
**Declaration:**
Swift Objective-C
```Swift
static func setHostApplicationSDKPluginVersion(_ version: String) -> Void
```
```Objective-C
+ (void)setHostApplicationSDKPluginVersion:(NSString *)version
```
**Parameters:**
| Parameter | Type | Mandatory | Default | Description |
| --- | --- | --- | --- | --- |
| **version** | String | yes | - | Specifies the version of the Synerise SDK plugin in the host application |
**Return Value:**
No value is returned.
## Enable Debug Mode
---
This method enables or disables console logs from Synerise SDK.
It is not recommended to use debug mode in the release version of your application.
Swift Objective-C
```Swift
static func setDebugModeEnabled(_: Bool) -> Void
```
```Objective-C
+ (void)setDebugModeEnabled:(BOOL)enabled;
```
**Parameters:**
| Parameter | Type | Mandatory | Default | Description |
| --- | --- | --- | --- | --- |
| **enabled** | Bool | yes | - | Enables or disables console logs |
**Return Value:**
No value is returned.
## Enable Crash Handling
---
This method enables or disables crash handling by Synerise SDK.
If set to true, Synerise SDK will send the `client.applicationCrashed` event with information about crash.
Swift Objective-C
```Swift
static func setCrashHandlingEnabled(_: Bool) -> Void
```
```Objective-C
+ (void)setCrashHandlingEnabled:(BOOL)enabled
```
**Parameters:**
| Parameter | Type | Mandatory | Default | Description |
| --- | --- | --- | --- | --- |
| **enabled** | Bool | yes | - | Enables or disables crash handling |
**Return Value:**
No value is returned.
## Set Background Task identifiers
---
This method sets identifiers for Background Tasks processing.
| | **iOS SDK** | **Android SDK** | **React Native SDK** | **Flutter SDK** |
| --- | --- | --- | --- | --- |
| Introduced in: | 4.23.0 | - | - | - |
Do not use those identifiers for other Background Tasks in your app.
Swift Objective-C
```Swift
static func setBackgroundTaskIdentifiers(_: [String]) -> Void
```
```Objective-C
+ (void)setBackgroundTaskIdentifiers:(NSArray *)identifiers
```
**Parameters:**
| Parameter | Type | Mandatory | Default | Description |
| --- | --- | --- | --- | --- |
| **identifiers** | [String] | yes | - | Identifiers for Background Tasks registered in the host appliaction. |
**Return Value:**
No value is returned.