How to Add Custom Amount with PayPal Express Checkout in Magento 2

Adding a custom amount with PayPal Express Checkout in Magento 2 is essential when you want to charge extra fees or offer discounts based on specific conditions. This might include applying a handling fee, gift wrapping charge, or promotional discount.

In this article, we’ll explore two effective methods to add custom amount with PayPal express checkout in Magento 2: overriding the payment model and using an observer to customize the amount.

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Things to Prepare Before Adding a Custom Amount with PayPal Express Checkout

First of all, you need a registered module. Then, to add the amount with PayPal Express Checkout in Magento 2, follow these steps with 2 methods.

Method 1: Override the Payment Model

Step1: Dependency Injection Configuration

Create file app/code/Vendor/Module/etc/di.xml

Add the following content to di.xml:

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <preference for="Magento\Paypal\Model\Express\Checkout" type="Vendor\Module\Model\PayPal\Express\Checkout"/>
</config>

Step 2: Custom Checkout Model

Create file app/code/Vendor/Module/Model/PayPal/Express/Checkout.php

Add the below-mentioned code:

<?php
namespace Vendor\Module\Model\PayPal\Express;

class Checkout extends \Magento\Paypal\Model\Express\Checkout
{
    public function start(
        $token,
        $returnUrl,
        $cancelUrl,
        $customerId = null,
        $cartId = null
    ) {
        // Customize the amount here
        $this->_quote->setBaseGrandTotal($customAmount);
        $this->_quote->setGrandTotal($customAmount);

        // Call parent method
        return parent::start($token, $returnUrl, $cancelUrl, $customerId, $cartId);
    }
}

Step 3: Let clear cache and Di Compile

Run the following commands to clear cache and Di Compile:

bin/magento c:f
bin/magento s:d:c

Method 2: Customize the amount in PayPal Express Checkout using an observer to add a custom fee

Step 1: Event Configuration

Create file app/code/Vendor/Extension/etc/events.xml

Add the following content to events.xml:

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="paypal_express_checkout_prepare_line_items">
        <observer name="vendor_extension_add_custom_fee" instance="Vendor\Extension\Observer\AddCustomFee"/>
    </event>
</config>

Step 2: Observer Class

Create file app/code/Vendor/Extension/Observer/AddCustomFee.php

Step 3: Let clear cache and Di Compile

Run the below code to clear cache and Di Compile:

php bin/magento c:f
php bin/magento s:d:c

<?php
namespace Vendor\Extension\Observer;

use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;

class AddCustomFee implements ObserverInterface
{
    /**
     * Execute observer
     *
     * @param Observer $observer
     * @return void
     */
    public function execute(Observer $observer)
    {
        /** @var \Magento\Payment\Model\Cart $cart */
        $cart = $observer->getEvent()->getCart();
        $customAmount = 100; // Set your custom amount here
        
        $cart->addCustomItem(__('Custom Amount'), 1, -1.00 * $customAmount, 'customfee');
    }
}

Important Considerations

• Currency Handling: Ensure the custom amount is correctly handled in the store’s currency.
• Tax Implications: Consider whether the custom amount needs to be taxable.
• Payment Gateway Compliance: Ensure the changes comply with PayPal’s requirements and guidelines.

Summary

By following either of these methods, you can successfully add custom amounts with PayPal Express Checkout in Magento 2. Remember to thoroughly test your implementation to ensure accurate calculations and a seamless checkout experience for your customers.

Related Posts:

How To Install And Configure PayPal For Shopware Store

How to Configure PayPal Payment for Shopware Store

How to Add Product To Cart With Custom Price in Magento 2