Add additional payment module (We have already paypal & stripe module)

I have a website with codeigniter framework, well coded, and already have paypal & stripe module. What i need now is add new additional local payment gateway. This new payment gateway itself has complete PHP SDK you can use and versatile documentation from their github pages. It will be easy for you if you understand codeigniter and php because you can modify from existing payment module.
Apply only if you able to modify it. Thank you.