B4X FEED Verify Play Store App Subscription via PHP

[PracticalBot]

Not exactly b4x but certainly can be useful to a lot of us, so sorry if this is in the wrong place.

Does anyone have an example of how to verify that a user has a current subscription via PHP.
I want to up the security of my app and only allow valid users through to online content.
I know I can do this in the app and I do, but hackers can also access this code easily and are already hacking my app and offering subscription free versions.

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