Payment gateway integration with Wordpress Site

Payment Gateway expert

Hi, Payment gateway expert and already implemented JCC Payment gateway for WP Group buying script.Here is the project link https://www.freelancer.com/projects/PHP/Implement-jcc-payment-gateway.html and you will notice it as "COMPLETED" So it shouldn't be a problem to integrate yours. Please provide integration manual and take a look at my reviews at https://www.freelancer.com/u/brycep.html Thanks!