Android App Server Error Fix

I'm currently facing an issue with my Android app's payment gateway. Specifically, error messages pop up during the payment process. The most frequent error is a "server not responding" message. This seems to occur while generating the payment token. I am looking for an expert to identify the root cause and resolve this error for smooth payment operations.

Ideal Skills:
- Proficient in Android app development
- Knowledge in resolving server errors
- Experience with payment gateways
- Exceptional problem-solving skills