I added both my Chase Visa debit card and my Capital One MasterCard credit card with no issues. Both were ready to use with Apple Pay seconds after adding them. I used my iPhone to pay at Walgreen's with my Chase debit card. Screen was off and I held my phone to the NFC terminal and put my finger on the Touch ID sensor. Screen came to life, fingerprint symbol showed as scanning my fingerprint on Chase automatically. If I had taken my finger off I am pretty sure I could have switched cards from that screen and put my finger back on the sensor to continue. Card scanned in like a second, then the payment terminal continued on to ask for debit PIN and to confirm transaction. Pretty cool experience. No taking out my wallet, taking out my card, swiping it, and putting it back. But it's not just scan and leave.