A note about entering in one's credit card info into their phone system. It seems the entering of the numbers must be performed at a reasonably fast pace, otherwise the system won't properly detect the numbers.
Their credit card entering system has one other problem. After entering one's card expiration, it declares that you've entered the wrong security code, at which point I enter the security code. Not sure if it properly recorded the expiration date/security code or conflated the two.