Wish AndroidPublisher Tutorial

Hi,

Be good if someone could create a tutorial on how to use AndroidPublisher in B4J.

When a user purchases our B4A app (in-app purchase), get it to send a message to our B4J app to check Google Play and confirm the payment was actually successful.

https://developers.google.com/android-publisher/api-ref/purchases/products/get#auth

Here: https://www.b4x.com/android/forum/threads/google-play-developer-api.81839/#post-518277