The following classes are available globally.
Instance ID provides a unique identifier for each app instance and a mechanism to authenticate and authorize actions (for example, sending an FCM message).
Once an InstanceID is generated, the library periodically sends information about the application and the device where it’s running to the Firebase backend. To stop this. see
Instance ID is long lived but, may be reset if the device is not used for a long time or the Instance ID service detects a problem. If Instance ID is reset, the app will be notified via
If the Instance ID has become invalid, the app can request a new one and send it to the app server. To prove ownership of Instance ID and to allow servers to access data or services associated with the app, call
@interface FIRInstanceID : NSObject