Check the issuing company IBAN. On the invoice, review the amount due, currency and variable symbol or other payment reference. When copying an older draft, do not assume every payment detail remains suitable.

Correct an incorrect account in the source data first. Visually replacing an IBAN in a downloaded PDF can leave the QR pointing to the original account, producing two different payment instructions on one document.

Open the current PDF and scan the QR in a supported banking app. Before authorizing a transfer, compare its account, amount, currency and reference with the invoice. You do not need to send money to perform this check.

If the QR is missing or the banking app reports an error, check the data and display quality. A missing QR does not itself make the invoice unpayable: the customer can use the readable payment details when they are correct.

For a synthetic example, an invoice requests €100.00 and the customer scans it but does not authorize the transfer. Scanning does not put €100.00 into the account. Payment verification must use the transaction or other appropriate evidence.

For a partial payment, compare the paid amount with the balance. Bank matching is a separate workflow available on the relevant plan; the QR itself does not provide reliable payment status.