Credit Card Validator

 A credit card validator is a tool or algorithm used to verify the validity of a credit card number.

It typically performs several checks:

  1. Format Check
    Length:     Ensures the card number has the correct number of digits, typically 13 to 19 digits, depending on the card type (e.g., Visa, MasterCard, etc.).
    Prefix: Checks if the number starts with valid card-specific prefixes (e.g., Visa cards start with a 4).
    2. Luhn Algorithm (Modulus 10)
    This is the core of the validation process. The Luhn algorithm helps determine if the card number is valid based on a mathematical formula:
    Starting from the rightmost digit, double the value of every second digit.
    If doubling results in a number greater than 9, subtract 9 from it.
    Sum all the digits.
    If the total modulo 10 is 0, the card number is valid; otherwise, it’s invalid.
    3. Additional Validations
    Expiration Date: Ensures the card hasn’t expired by comparing the expiration date against the current date.
    CVV/CVC Code: Checks if the card verification value/code is valid, although this is typically more relevant for transaction processing rather than validation.
    4. Issuer Identification
    Identifies the card issuer based on the first few digits, known as the Bank Identification Number (BIN). This helps ensure the number belongs to a legitimate card provider.
    The validator can be implemented in various programming languages and is often used in online forms to catch errors before processing payments, ensuring that the entered card information is structurally valid.

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Credit Card Validator

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