Need to integrate payrexx Payment gateway Integration

Hello,

We have purchased below product from codecanyon and the product is already Live and working.

https://codecanyon.net/item/food-delivery-multi-restaurant-ionic-5-codeigniter-android-ios-website-admin/30939138

Below are the technology used
Web Api's :- Codeigniter
Website :- Angular Js
Android & Ios app:- Ionic Framework

We want payrexx payment integration for above app. Please find below api document for payrexx

https://developers.payrexx.com/reference/rest-api

Kindly bid if you can do the integration please don't bid if you can't do unnecessarily I don't want to waste both of us time.

Thanks