docs: private String FCMGetFreshToken(final String senderID) {
          String token = null;
          try {
              if(senderID != null){
                  getConfigLogger().verbose(getAccountId(), "FcmManager: Requesting a FCM token with Sender Id - "+senderID);
                  token = FirebaseInstanceId.getInstance().getToken(senderID, FirebaseMessaging.INSTANCE_ID_SCOPE);
              }else {
                  getConfigLogger().verbose(getAccountId(), "FcmManager: Requesting a FCM token");
                  token = FirebaseInstanceId.getInstance().getToken();
              }
              getConfigLogger().info(getAccountId(),"FCM token: "+token);
          } catch (Throwable t) {
              getConfigLogger().verbose(getAccountId(), "FcmManager: Error requesting FCM token", t);
          }
          return token;
      }