How to build (with linux :))

Clone this Git repository
Set java and SDK PATH

use your system path

for example:

export JAVA_HOME=/usr export ANDROID_SDK_ROOT=/home/max/coding/Android/Sdk

Put godot-lib.***.release.aar in ./godot-google-play-billing/libs/
Run ./gradlew build in the cloned repository

use java 11

sudo update-alternatives --config java