Hello, Hope you are doing well
I am experience android developer with 3+ years of experience and having hands on experience of integration of payment gateways in E-Commerce apps. Recently i have integrated Paytm, rezorpay, payu payment gateways in my recently created apps.
In your job posting you did not mention which payment getaway you need to integrate in your app .Please come in chat section so we can talk and proceed to finish payment getaway integration.
Thank You.