I'm anxious to start using Apple Pay but I can't seem to be able to add a credit card in Passbook. Whether I try to add my American Express Costco card or my bank Master Card or Visa cards, the conclusion is always the same. I get a message that the card cannot be entered and that I should call the card issuer. Even the Visa card that I use for the apple store doesn't show up in Passbook and I can't enter it again. Why is this happening and are there any tricks to getting my cards added? I'm frustrated by this whole process.