The cashier enters the receipt number to look up. This query is sent to the web service. The web service tries to retrieve the corresponding transaction from the remote database. If the query is successful, the transaction is copied to the POS database. The transaction is automatically refunded during this process.
Error handling
If the remote database is unavailable, the POS returns a message stating this.
If the transaction is not available in the remote database, the POS returns the error message that the transaction was not found.
If the transaction was found but has already been refunded, the POS returns an error message.