Hello,
We understood the concept of the app and can do it. Basically, it will allow users to browse through the library of books and subscribe to it monthly or annually. We believe you will provide the contents of the library and API for the payment gateway. We would also need the wireframe for the app so that we can understand the exact flow and the feature requirement so we can bid accordingly.
We worked on many apps and can share examples of our previously developed projects just for a reference of our expertise. If you have any queries or would like to have a quick discussion then please contact us. We look forward to your response.
Regards,
OKTeam