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Title:
Credit Card number validation
Can anyone tell me the rules to validate a credit card number?
I need to pre-validate a file of credit card debits before we upload it to avoid having to...
- stop the upload
- edit the text file to remove the invalid card number
- re-start the upload
I know that numbers begining with 4 are MC (or Visa) and numbers beginning with 5 are Visa ( or MC :) ). Is it true that all numbers must have 16 digits and are they always 4 groups of 4 numbers?
Any help is appreciated...
TIA
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