PHP Woocommerce create payment gateway

I would like to create payment gateway for woocommerce
Here is payment gateway document URL
https://slimcd.com/developers/

This is tutorial how to create woocommerce payment gateway
https://rudrastyh.com/woocommerce/payment-gateway-plugin.html
you can use any other way to create woocommerce payment gateway

Its easy job needs to get done by today.