[SOLVED] How to set the MobileIAP - Set public key

The C3 manual says, "Sets the application's public key. This is used to identify the application to the store on Android, and isn't used on iOS. iOS uses the bundle ID instead.".

Question: Is this something I define or is there somewhere I can grab the public key from my app on Google Play? I never used this before and it seemed to work fine, but how would I go about this on Android?

Construct 3 manual: https://www.construct.net/en/make-games/manuals/construct-3/plugin-reference/mobile-iap