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Hello,I am trying to determine if an in-app purchase will be required within the app we are developing. We provide continuing education courses in video format. Someone would watch the course, evaluate the course, and take a short exam about the course. Those who pass the exam are also entitled to a CE certificate that is automatically emailed to them and then printable for their records. Would this type of scenario require the purchase to be in-app or would I be able to implement my own payment system when somebodt wants to buy one of our courses?Thanks in advance!Ken