4 ms·
Perhaps existing forms make you select the type of card as an extra check.
by ape4 13y ago
Perhaps existing forms make you select the type of card as an extra check.
- larrykubin 13y agoI believe you can tell the type of card with a regular expression: http://stackoverflow.com/questions/72768/how-do-you-detect-credit-card-type-based-on-number http://stackoverflow.com/questions/72768/how-do-you-detect-c...
- infogulch 13y agoNot a very good reason, if you mistype a cc number it will most likely be completely invalid anyway.