Root Cause

• Unsupported currency: The payment gateway does not support the provided currency code.

• Typographical error: The currency code provided in the payment request is incorrect or misspelled.

• Merchant account restrictions: The merchant's payment gateway configuration does not allow processing transactions in certain currencies.

• Gateway limitations: Some gateways only support a specific set of currencies based on region or account type.

Troubleshooting and Solutions

• Inform the customer that their payment failed due to an invalid currency code.

• Verify that your merchant account at the payment gateway is configured to accept the currency involved in the transaction.

• If multiple currencies are supported, suggest the customer select a different currency and retry.