American Express

[Martinspire]

The numbers to enter for an American Express card are different, 1 number less and the order is xxxx xxxxxx xxxxx.

Perhaps a toggle for input would be best?

[wangjohn]

Could you show me what you mean?

American Express card numbers are already handled on the credit card number input form. If you begin typing a 34 or a 37 into the form, then the form will adjust to use the xxxx xxxxxx xxxxx format that you mentioned. The security code field will also allow you to type 4 letters and also validate for 4 letters (instead of the default 3).

Please let me know if that doesn't cover what your looking for.