I\'m testing the iOS SDK of cardIO for scanning credit card, I followed the instructions in https://github.com/card-io/card.io-iOS-SDK , but I open my CardIOPaymentViewControlle
Dave from card.io here.
Not all cards can be successfully scanned by card.io. For example, some recent credit cards use small, non-embossed digits rather than the traditional large, raised numbers for which card.io is currently designed.
Try a few different cards to determine whether this is a card-specific problem.