Yes, this one's a known issue -- the switch/maestro standards are not strictly enforced when the Credit Cards are manufactured. As such, the gateways have a hard time pre-validating the data. Best to not validate the issue number or start date fields ... just submit them raw, and if no value is supplied by the customer, enter 00 as a default. The credit card issuing bank will have to be the final authority on the validity of the card ... which is an issue PayPal will handle for you.




