Checksums and credit card checks that do not require a connection to a financial institution

Question

The validations that I know of are as follows:

• Checksum: the entire card number must be zero. (range 0-9)
• Check the first digit for card type
• Check length on card type
• Check the CCV length for the type of card (I think that all the main types are 3 anyway)
• Of course, make sure that the card type is accepted, and also not expired.

Are there any other validations :) (I expect that many people are not aware of all these things)

The reason I'm asking for is because I heard that there was a checksum number against expiration or CCV. I just wanted to check.

Answer 1

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