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Custom coupon code apply for mobile web services API. I have create after very hard work. so help to you

   


  if (!empty($data['id_shop']) && !empty($data['id_lang']) & !empty($data['id_cart']) & !empty($data['coupon_code'])) {

        $context = Context::getContext()->cart = new Cart($data['id_cart']);
        $context = Context::getContext();
        $cart = new Cart($data['id_cart']);
        
        if (($cartRule = new CartRule(CartRule::getIdByCode($data['coupon_code'])))) {
            
            if ($error = $cartRule->checkValidity($context, false, true)) {
                $success_array = array('success' => '0', 'text' => $error);
                echo $senddata = json_encode($success_array);

            } else {
                $cart->addCartRule($cartRule->id);
                $cartProducts = $cart->getCartRules();
                
                $success_array = array('success' => '1', 'id_cart_rule' => $cartProducts[0]['id_cart_rule'], 'discount_price' => $cartProducts[0]['value_real']);

                echo $senddata = json_encode($success_array);
            }
        }
    }