Gateway de pagamento

Gateway.php

<?php 

namespace Payment;

interface Gateway
{
	 public function processPayment($order_id);
	 
	 public function success($order_id);
	 
	 public function callback();
  
}

MethodPayment.php

<?php 

class MethodPayment 
{	
	private $gateways;
	
	public function __construct() 
	{
		$this->gateways = [];
	}
	
	public function addGateway(Gateway $gateway) 
	{
		$this->gateways[] = $gateway;
	}
	
  
}

PagSeguro.php

<?php 

namespace Payment;

class PagSeguro implements Gateway {

  public function processPayment($order_id)
  {
  
  }
	 
	public function success($order_id) 
  {
  
  }
	 
	public function callback() 
  {
  
  
  }
}