Where are form handlers in Wordpress/Woocommerce?

Question

WordPress

Since I’m used to developing on self-written hooks and the like, I don’t rummage, but I roughly understood that they can be changed in functions through action, filter. Now I am implementing the API of payment by card. So I can’t figure out where to find the PHP code that processes the Checkout form. The idea is that I just find the same hook, copy it to functions and change it for myself. The old script is a standard Wookomers one, redirects to the payment page of the Wookomers plugin itself, but I need it to be redirected to the bank page with a check when submitting the form with the choice of the payment method "By bank card".

Answer 1

So it doesn't work. WooCommerce has a Payment API that allows you to create your own gateways. In short, you need to extend the WC_Payment_Gateway class and override its methods.
Here are the references:
- https://docs.woocommerce.com/document/payment-gate...
- https://rudrastyh.com/woocommerce/payment-gateway-...