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public class FirebaseMessagingHelper extends FirebaseInstanceIdService {

    static public String token;

    @Override
    public void onCreate() {
        super.onCreate();

        token = FirebaseInstanceId.getInstance().getToken();
        if(token != null) Timber.d("Token %s", token);
    }

    @Override
    public void onTokenRefresh() {
        token = FirebaseInstanceId.getInstance().getToken();
    }
}