Programmatically: How to create custom Magento payment gateways

Step 1: Create a new module

Create a new directory MyCompany/CustomGateway under the app/code/local directory. Inside this directory, create the following files: CustomGateway.php (module declaration) etc/config.xml (module configuration) Model/Payment/Gateway.php (payment gateway model) Helper/Data.php (payment gateway helper) CustomGateway.php

		

	use Magento\Framework\Module\AbstractModule;

	class MyCompany_CustomGateway_Model_Module extends AbstractModule
{
    public function __construct(
        \Magento\Framework\App\ObjectManager $objectManager,
        \Magento\Framework\Module\Manager $moduleManager
    ) {
        parent::__construct($objectManager, $moduleManager);
    }

    public function register() {
        // Register the payment gateway
        $this->getterRegistry->register('my_custom_gateway', 'MyCompany\\CustomGateway\\Model\\Payment\\Gateway');
    }
}
	

etc/config.xml

		
	
    
        
            true
            
                Magento_Sales
            
        
    
	
	

Model/Payment/Gateway.php

namespace MyCompany\CustomGateway\Model\Payment;

class Gateway extends \Magento Payment Model\Gateway
{
    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry\Registry $registry,
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        \Magento\Framework\DB\Adapter\Zend_Db_Adapter_Pdo_Mysql $connection,
        \Magento\Sales\Model\Order\Payment\ConfigInterface $paymentConfig,
        array $data = []
    ) {
        parent::__construct($context, $registry, $scopeConfig, $connection, $paymentConfig, $data);
    }

    public function canCapture()
    {
        return true;
    }

    public function capture(array $ignoreInvalidOrder = false)
    {
        // Your custom payment processing logic here
        // ...
    }
}
	

Helper/Data.php

	
	namespace MyCompany\CustomGateway\Helper;

	class Data extends \Magento\Framework\App\Helper\AbstractHelper
{
    public function getPaymentMethodLabel()
    {
        return 'My Custom Payment Method';
    }
}
	

Step 2: Add the payment gateway to the payment method list

In the payment.xml file under the app/design/frontend/YourTheme/Magento_Sales/etc/design_config.xml directory, add the following code:

		
	
    
        

            
                
                    My Custom Payment Method
                    1
                
            
        
    
	
	

Step 3: Configure the payment method in the backend

Go to System > Configuration > Sales > Payment Methods and add a new payment method with the name "My Custom Payment Method".

Step 4: Test your custom payment gateway

Now you should be able to select your custom payment method during checkout. When you click "Place Order", the payment gateway will be triggered and your custom logic will be executed.