Could anyone please help guiding me to the following:
I am developing an app that will provide some sort of event sharing information between business and users. This is not integrated with iOS calendar or reminders. The data is entirely stored on the cloud and the app access the data through a REST service.
I would like the users to pay a monthly fee for using the app. So this is not really a digital subscription. I am not selling any content in the app. It is merely to cover the expenses to run web services and databases and infrastructure on the cloud.
Question : Do I must use in App Store purchase API for monthly payments by my users? Can I integrate external payment system like PayPal in the app for this purpose?