function callback(username, password) {
            // Android / iOS
            if (typeof CGT != 'undefined' && typeof CGT.callback != 'undefined') {

                if(registrationData.device_type === 'mobile') {
                    CGT_LOGIN_CALLBACK = {
                        username: username,
                        password: password
                    }
                }

                CGT.callback(username, password);
                CGT.close();