I can't test this due to the product being out of stock, but I wonder what their approach to PCI compliance is. Processing credit card data has a high compliance burden if you're unwilling to use a secure widget made by an already-authorized provider like Stripe. That's for a good reason, most web and mobile apps are designed such that their backend servers never see your full credit card number and CVV. You can't do…
PS: I work at Stripe but I don't really work on the PCI compliant part of the company.