I appreciate you joining in this thread, Carabeo Brothers.

As referenced by my peers above, adding QR code on invoices is currently unavailable in QuickBooks Online. You may have turned some third-party application that supports this feature the reason why you have the option to add a QR code.

You may search for third-party applications that integrate well and provide seamless scanning of barcodes. Though, we're unable to provide recommendations on which one to use.

I suggest you visit the QuickBooks Apps site and look for an app that meets your business needs. You can also do this inside your company, just go to Apps on the left panel and then enter a keyword in the search field.

In case you need help with utilizing your sales forms templates in QuickBooks Online as well as on what other information you can add, you can go through the resources below:

Customize invoices, estimates, and sales receipts in QuickBooks Online.

Add, customize, or remove logos on sales forms.

If I can be of assistance while working in QuickBooks, please let me know. I'd be more than willing to lend you a hand.