/**
  * Finds the PaymentChannel model based on its primary key value.
  * If the model is not found, a 404 HTTP exception will be thrown.
  * @param integer $payment_channel_id
  * @param integer $customer_id
  * @return PaymentChannel the loaded model
  * @throws NotFoundHttpException if the model cannot be found
  */
 protected function findModel($payment_channel_id, $customer_id)
 {
     if (($model = PaymentChannel::findOne(['payment_channel_id' => $payment_channel_id, 'customer_id' => $customer_id])) !== null) {
         return $model;
     } else {
         throw new NotFoundHttpException('The requested page does not exist.');
     }
 }