code: public void initialize(Context context, String appGUID, String pushClientSecret) {
      this.initialize(context,appGUID,pushClientSecret,null);
    }
docs: MFPPush Intitialization method with clientSecret and Push App GUID.
  <p/>
  
  @param context          this is the Context of the application from getApplicationContext()
  @param appGUID          The unique ID of the Push service instance that the application must connect to.
  @param pushClientSecret ClientSecret from the push service.