I need an Android studio and php programmer

Hey, guys I need your help to integrate a payment API to and Android app, the app is developed using Android studio and php on the server side, you should be able to set API on the server the update the Android app, my budget is small but I really need your help. It amobile money API, what I what is to have my app user be able to deposit and withdraw money using this API from their wallet, all link is https://momodeveloper.mtn.com please check,