| 摘要 |
A method is disclosed. The method includes a) receiving a dynamic data element and a first verification value derived from the dynamic data element, wherein the first verification value is generated in response to a transaction conducted using a portable consumer device, b) determining if the dynamic data element is within a predetermined range, c) if the dynamic data element is within the predetermined range, generating a second verification value, d) determining if the second verification value matches the first verification value, or if the second verification value is otherwise acceptable, and e) initiating the approval the transaction if the second verification value matches the first verification value.
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