I want to make a library application that I can sell the epubs I have and at the same time the buyers can read, can you help me?
I closed and unlisted your other topic. Next time please just edit your old one instead of opening another one.
First, for a library application, you must store all the e-book on a common server.
Use Firebase (Cloud DB also can be used)
If you really want to have the app buying and selling products use the In app billing component.
I can help you, but i don’t understand where’s the problem