None of my cards (visa and Mastercard) work. When II attempt to add them, Samsung pay pops an error message stating I need to contact the card issuer as it is not supported. I thought we were going good to be able to add any visa or Mastercard like you can with Google wallet, PayPal, etc. But it looks like we can't, I think Samsung wants to get a piece of every transaction or it we can't have the convenience of Samsung pay. I understand this, however it does not leave me a satisfied Samsung customer.