Symptoms
CreditCard2AccountAdd_API fails with an error message:
Credit card number is invalid
How to correct it if the credit card number is correct?
Cause
The payment system does not have mask assigned, or the credit card number passed does not correspond to the mask set.
Resolution
Assign or change the Mask:
Home > System > Settings > Payments Processing > Payment System Name > Masks
in a format like 5IIIIIIIIIIIIIII