The transaction was submitted without the correct currency code required for processing.
A gateway or integration error omitted or mis-sent the required currency code field.
Almost always a technical integration issue for merchants selling in multiple currencies.
Your gateway's submission log showing the currency code sent.
Work with your payment processor to confirm and correct the currency code if still within the window.
Not validating currency-code fields after adding a new market/currency.
Validate currency-code handling whenever you add a new supported currency.
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