evshop_api/app/common/shipping/ShippingStrategy.php

<?php
namespace app\common\shipping;

use app\common\shipping\ShippingFactory;

class ShippingStrategy
{
    private $shippingGateway;

    public function __construct($shipping_code){
        $this->shippingGateway = ShippingFactory::createShippingService($shipping_code);
    }

    public function request($data){
        return $this->shippingGateway->request($data);
    }

    public function response($data){
        return $this->shippingGateway->response($data);
    }

    public function map($data){
        return $this->shippingGateway->map($data);
    }

    public function mapResponse($data){
        return $this->shippingGateway->mapResponse($data);
    }

    public function printLabel($data){
        return $this->shippingGateway->printLabel($data);
    }

}