Google Pay API Integration Troubleshooting

I'm facing an issue with my Android app where I'm unable to add the Google Pay API. The problem specifically lies in the API setup. I need an experienced Android developer with expertise in API integrations, particularly the Google Pay API.

Key Requirements:
- Extensive experience with Android app development
- Proven track record in integrating APIs, with a preference for the Google Pay API
- Excellent problem-solving skills to troubleshoot and resolve API setup issues
- Ability to deliver quality work under pressure and within a tight timeline.