Error processing debit "Invalid Mac 499" Print

Modified on: Tue, 9 Apr, 2024 at 1:54 PM

Overview

When processing a debit transaction you may receive an "Invalid Mac 499" declined error. This error only applies when processing a debit sale, credit card transactions works without an issue.

Solution

Reinstall dsiEMVClientX or update dsiEMVClientX. A lower version dsiEMVClientX could also cause this issue.
Restart the computer
Perform a Parameter download and Key change
Test and Debit transactions should now operate

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