What does 'Invalid USSD code' mean?
This means that the customer dialled an incorrect USSD code while trying to complete a USSD payment. There could be a digit or two missing from the one generated on the checkout form to make payment.
What can I do about it?
The customer can retry the transaction and ensure they are dialling the correct USSD code generated on the checkout interface for making payment by just tapping on the code presented and dialling it to complete the payment.