does zencart authomatically check credit card validity

[needslotsofhelp]

So far the only way to check it is through authorize.net, is there anyway to check if the credit card is valid through simple php? I know that there is a special algorithm for checking if the credit card number is valid or not.

Just to save time is there such a function in php/zen-cart?

[DrByte]

The supplied payment modules pre-validate the validity of the CC numbers automatically, using the standard MOD10 algorithms, as well as noting the typical numerical patterns of the more popular cards.

[swguy]

... and the contribs I've looked at reuse this core logic (see includes/classes/cc_validation.php).

Good luck,
Scott