Digistore is a payment provider where you can sell digital and physical products and tickets. As with Affilicon, you can sell your products by direct debit, credit card, etc... without a complex registration process and has an integrated affiliate program. IPN stands for Instant Payment Notification. For example, if you regularly launch email campaigns to inform your customers about the sale of new products, IPN notifications allow you to automatically integrate a buyer and their contact details into your email marketing system.
Read here about how to connect Digistore24 with Quentn.