My situation is, I have implemented an in-app billing product "remove ads" in my app for 0.99.
Now I wanna make it be free in a period of time for advertisement.
However, google play console not allow us to adjust product's price below 0.99.
So, after some survey, what I think is to implement this feature by a server.
I means, to check users' account by our server before calling google's in-app billing service.
Therefore my question is :
Above are what I think, but I'm not sure if there are other much better or easier solution about this issue? For example, maybe no need a server?
Or using a own server is the only way to implement the "time-limit free" feature?
Thanks you~!