Add payment gateway on my site -- 2

Hi, There Can anyone add cashfree payment gateway on my this site -> carnivalshop.in/register

Website details :-
Framework used - CodeIgniter

How to add payment gateway on my site -> https://help.carnivalshop.in/help-center/articles/1/11/adding-gateway

You just need to setup it up..

My Buget is 1499 INR

Thank you