Error codes for FCM failure conditions.

UNSPECIFIED_ERROR No more information is available about this error.
INVALID_ARGUMENT Request parameters were invalid. An extension of type google.rpc.BadRequest is returned to specify which field was invalid.
UNREGISTERED App instance was unregistered from FCM. This usually means that the token used is no longer valid and a new one must be used.
SENDER_ID_MISMATCH The authenticated sender ID is different from the sender ID for the registration token.
QUOTA_EXCEEDED Sending limit exceeded for the message target. An extension of type google.rpc.QuotaFailure is returned to specify which quota got exceeded.
APNS_AUTH_ERROR APNs certificate or auth key was invalid or missing.
UNAVAILABLE The server is overloaded.
INTERNAL An unknown internal error occurred.

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