At this time, I do not process credit cards. I am given the type of card, the last four digits and the expiration date. Before I was on RENXT, I could put just the last four digits in the field. In RENXT, the number disappears when I tab out of the field.
This is a problem with the newest patches for RE on the desktop, too! It used to be fine, but now we have to add zeros to the front of the number to preserve the last 4 digits.