Android Question In AppBilling developer's back end activation with Google Developer API


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Licensed User
Hi everyone,

Driving always in the safe lane I would like to make a back end that will check for the InApp Purchase of a product by a user and then it will activate through the back end the application. I Googled a lot and I ended up finding in Google Developer API the following two pages:

I have two questions:
1) How can I get the token mentioned through the InApp Billing B4A library?
2) What can you make out of the acknowledge page because I am not exactly sure that I understood the use of this API.