[ic] Credit card validity check

[Grant]

I'm on 5.6.2 and I'm trying to get my checkout page to check the
credit card number and expiration date for validity.  It works if I
set the following in a form profile:

&credit_card=standard visa mc discover amex

but then [charge] fails with "Credit card number is required" so
&credit_card must delete the mv_credit_card_number value.  How can I
get them both to work?

- Grant