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What is an authorization code?

au - tho - ri - za - tion code
noun

An authorization code serves as a numeric confirmation, furnished by the card issuing institution, validating the approval of a sales transaction. This code is transmitted as an assurance that the transaction has received the necessary authorization. As an integral part of the transaction process, every merchant sales draft is consistently paired with an authorization code.

In essence, this code acts as a secure token, verifying the legitimacy of the transaction and substantiating that it has been duly sanctioned by the card issuer.