Credit Card Preamble
A credit card preamble—sometimes called a credit card prefix, issuer identification number (IIN), or bank identification number (BIN)—is a digit or series of digits at the beginning of a credit card number that identifies the type of card or company that issued the card.
Adhere to the following rules for governing a valid credit card
preamble:
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The Start and End preambles must end with an asterisk (*) (for example, 304*).
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The number of digits in the Start and End fields must be the same.
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The number of digits in the Start and End fields cannot exceed the Length defined.
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The value of the End field must be greater than the value of the Start field.