Payment Integration for Android App Hybrid Framework app - Ionic, Onsen ui, phonegap, PHP experience needed

I have a hybrid multi restaurant Android app that was made using Onsen UI framework (like Ionic). Eveything is installed and running perfectly. This system already has about 7 payment gateways installed and running and Now i would like to add one more payment gateway. The payment gateway is in portuguese language, on this url: [login to view URL] Other links may help you: [login to view URL] [login to view URL] Call me on chat i can send you the zip files for you can check the app. I can send also apk and backend credentials for having better idea of app. Ionic, Onsen ui ( [login to view URL] ), phonegap, PHP skills would be good. Before call me on chat please chech all the URL links on this description. Thanks for attention.