QR Codes on Receipts and Invoices: e-Invoice Links and Warranty Registration

1. Common Uses

* Link to a digital copy of the invoice on a secure page. * Open a warranty registration form pre-filled with the order number. * Confirm payment with a reference code the customer can verify. * Encode a payment URI for outstanding invoices.

2. Payload Choice

For links, keep the URL short and use HTTPS. For payment URIs, follow the standard for your country (UPI, Pix, EPC QR, etc.).

3. Thermal Printers

Thermal receipts use heat-sensitive paper that fades over months. If the customer will scan the code much later, keep a digital backup or use a URL that stays valid.

4. Regulatory e-Invoice

Several countries now require QR codes on tax invoices (India, Saudi Arabia, Mexico). Follow the published specification from the relevant authority exactly, including any signature or hash fields.