Q: I am getting an Invalid Card Number error. A: This means that the number is not matching up with any valid accounts when we send it for processing. Make sure that: You have entered the number from the front of the card with no dashes or spaces. The number must be exactly correct, so double check for typos. If the card is a debit card, make sure it is a check card with a credit card logo on it. If it does not have a credit card logo, it will not work.