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Troubleshooting

The message “ERROR: Unable to create transaction” appears on the invoice​

Go to the Gateway Log in the WHMCS Admin Area to see a more detailed error message.

Invoices are not being marked as paid​

  • Check the gateway log if it contains any errors.
  • If no errors are present, check if the Webhook is configured properly (see configuration chapter)
  • Make sure your server is not blocking any of the Wallee IPs (see IP Whitelisting chapter)

The callback fails​

Check what HTTP code is being returned

  • 404 – Invoice not found in WHMCS
  • 406 – Currency not available in WHMCS
  • 406 – Invalid request from API
  • 409 – Transaction already present in WHMCS
  • 500 – Exception in the Wallee module – Check WHMCS Transaction logs
  • 503 – Wallee module not activated in WHMCS