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by peterangular
2674 days ago
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It COULD be a "real thing" but 100% don't believe it until someone links a study backing up a claim like that. Breaking up long numbers into smaller input fields CAN help with data-entry (think dyslexia etc.) but in the case of CC numbers that are of different formats (ie: VISA vs AMEX) there's no good way to "auto-format" it even if you knew the issuing PCN of the card before hand. So - best practice generally is, ignore the dashes and let it be entered as a 10-19 digit numeric only field (or 13-19 if you're not worried about ancient cards). Just don't allow non 0-9 characters in the input via JS which is SUPER easy. Then, before submission, ensure it passes a mod-10 Luhn check to let someone know they fat-fingered it! Easy-peasy. |
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this is plainly wrong. you can swap the mask as soon as you know it's amex from the prefix. i know because we do it without any issues. it's 4-4-4-4 for visa/mast/disc and amex is 4-6-5. you have more than enough info by 4 digits to choose the correct mask in all cases.