Lesson 26 assumed you have your own BIN, the unique number range that identifies your cards. Most fintechs don't. They run through a BIN sponsor (a regulated bank that lends them BIN access). Every card swipe now has THREE parties taking a slice of the interchange: the network (Visa/Mastercard), the sponsor bank, and you. The same gross ₦200 interchange becomes much less after both fees come out. This is the 'tax' of being unlicensed.