Is this possible using in-app billing?

Hi. Going to develop an app that will take the content from a third party server (I have access to it only using APIs) and provide it to users through subscription. The question is whether we can safely arrange for the provision of subscription and verification of the users on its availability in the app without using a server, which would have been of such verification, or without it, just will?
July 8th 19 at 16:19

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July 8th 19 at 16:21
Solution
All critical reliably can be checked ONLY on the server. No checks on the server can be hacked. There are no other options
What should be checked? Can you explain how the ideal is the mechanism of verifying the subscription and if the verification provision of the content? Of course I will be engaged in the study of the documentation, I just want to get an answer from a knowledgeable person that as a Yes. Thank you - adrian47 commented on July 8th 19 at 16:24
In man pages of Google to the payment all that is written. In short - when the device payment came, instead of charging to send it to the server, the server check using the key and the server already calculates the right product. The very mechanics of signature verification using the key in Google is described. - nicklaus commented on July 8th 19 at 16:27
: so it all comes down to the fact that not the application itself must determine, by results of check of subscription, what content to give to the user and the server? - adrian47 commented on July 8th 19 at 16:30
if you really to summarize - Yes - nicklaus commented on July 8th 19 at 16:33

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