Not all Maestro cards have start dates (or issue dates) on them as it turns out, and another field which one should try to collect when payment processing a Maestro card which may or may not be on an individual card is an issue number. As a concept, an issue number identifies a particular card for an account. In an American Express account, two cards, perhaps for a husband and wife, may both have the same credit card number, but may be distinguished in terms of which card was actually used to make a payment by the CVV number. The issue number in the Maestro scenario facilitates differentiation comparably. This concept may have existed in Switch and Solo cards too, but these card types are now absorbed into Maestro.
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