Electronic invoice

You need a 3rd party app to do so or use a 3rd party invoicing app to integrate with QBO.

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Adding QR codes to your sales invoices in QuickBooks makes it very beneficial for you and other companies. Also, this process will save your customers time. While this feature is unavailable, I recommend submitting feedback in QuickBooks Online (QBO). It enables our engineers to develop a solution to optimize your QBO experience.

Here's how: 

1. Go to the Gear icon on the upper right pane 
2. Select Feedback. 
3. Type your concern in the box and click Next. 

Because of user feedback, many of the system's features are available.

In the meantime, you can follow Fiat Lux - ASIA's recommendation using a third-party app that can add a QR code to your sales invoices. I'll guide you how where you can find multiple QuickBooks apps that you can also use: 

1. Go to apps.intuit.com. 
2. Select the correct country in the drop-down. 
3. Type QR code in the search box. 
4. Utilize the app that fits your business. 

Additionally, QuickBooks can personalize your sales form, like columns, rows, templates, email messages, logos, etc. To learn more about this feature, see this link: Customise invoices, estimates, and sales receipts in QuickBooks.

Please drop a comment below if you have QuickBooks concerns. I'm always here to back you up. Stay safe and well with your loved ones.