Magento 2 how to create custom payment method

To create a custom payment method in Magento 2, you will need to follow the following steps:

1. Create a custom module for your payment method by creating a directory with the name of your module under app/code directory of your Magento installation.
2. Create a registration.php file in the root of your module directory with the following code:

   <?php
   \Magento\Framework\Component\ComponentRegistrar::register(
       \Magento\Framework\Component\ComponentRegistrar::MODULE,
       'Vendor_Module',
       __DIR__
   );

   Replace Vendor_Module with the name of your module.

3.  Create a module.xml file in the etc directory of your module directory with the following code:

   <?xml version="1.0"?>
   <config xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
       <module name="Vendor_Module" setup_version="1.0.0">
           <sequence>
               <module name="Magento_Payment"/>
           </sequence>
       </module>
   </config>

   Replace Vendor_Module with the name of your module.

4.  Create a etc/payment.xml file in the etc directory of your module directory with the following code:

   <?xml version="1.0"?>
   <config xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Payment:etc/payment.xsd">
       <payment>
           <groups>
               <group_name translate="true">
                   <methods>
                       <method_name translate="true">
                           <title translate="true">Title of your payment method</title>
                           <model>Vendor\Module\Model\PaymentMethod</model>
                           <active>true</active>
                           <order_status>pending</order_status>
                           <can_use_checkout>true</can_use_checkout>
                       </method_name>
                   </methods>
               </group_name>
           </groups>
       </payment>
   </config>

   Replace group_name with the name of your payment group, method_name with the name of your payment method, and Vendor\Module\Model\PaymentMethod with the namespace and class name of your payment method model.

5.  Create a Model/PaymentMethod.php file in the Model directory of your module directory with the following code:

   <?php
   namespace Vendor\Module\Model;
   class PaymentMethod extends \Magento\Payment\Model\Method\AbstractMethod {
       protected $_code = 'method_code';
   }

   Replace Vendor\Module with the namespace of your module, PaymentMethod with the name of your payment method class, and method_code with a unique code for your payment method.

6.  Clear the Magento cache by running the following command in the terminal:
7.   php bin/magento cache:clean

Your custom payment method should now be visible in the Magento admin panel under Stores > Configuration > Sales > Payment Methods.