Who needs extra hardware to add mobile payments to iOS and Android? Not Card.io, who’s unveiled a new SDK for it’s visual card processing system alongside a payment app allowing anyone to accept payments from other users. Having already launched its scanner software development kit last year, the new SDK will open up the company’s payment process to third-party developers. The new payment app works across Android and iPhone platforms, with no need to register as a merchant to access the feature. Although there are no registration charges, payments made through either PayPal or your bank account will have an additional 3.5 percent plus 30 cents nudged on top of each transaction. Going dutch has never been more (begrudgingly) easy.