How to Test Android Payments With Expo in Development Mode

I recently was watching this RevenueCat YouTube video about adding in-app subscriptions with RevenueCat + Expo on iOS and Android.

And I commented:

Is it not possible to test the Android payments with a development build, without going through all the hoops of setting up an internal test program?

At first I thought it was not possible because I kept getting the same error when trying to test the payments in development mode:

Android says This version of the application is not configured for billing through Google Play

But I eventually found a way to make it work:

I built a development build and opened it on my device:

npx expo prebuild --clean
npx expo run:android --device

But to make it work I had to enable license testing in the Google Play console.

Once I had turned on this setting, I finally saw the payment popup with the test card on my Android device:

Android phone showing a subscription popover with the payment method "Test card, always approves"

Hope that helps!