How to test Android Pay with a debug APK?
No, there is not a debug mode option to that per docs:
https://developer.android.com/google/play/billing/billing_testing.html
set a separate machine with a CI server and have it do the alpha and beta builds for testing Google Play.
It is a pity but you have only one way to test IAP:
- Grant testing permission to your google accout used at your device
- Build .apk file.
- Upload it to your account at GoolePlay as beta version
- Wait until uploaded .apk processed
- Try do to actions you need and check it.
- If any issues - fix them and start from p. 2