The decline code 21, typically represented as “No Action Taken,” is a response from a credit card issuer indicating that the transaction has been declined, but without providing a specific reason or suggesting any corrective action. This can occur due to a variety of reasons such as issues with the card issuer’s processing system, a temporary communication error, or unspecified problems with the transaction request. When this code is received, it’s often recommended to contact the issuing bank for more detailed information and to ensure that future transactions can be processed successfully.
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