Thanks for sharing your insights, @Seattle_1.

For now, I’m unable to share with you the specific time frame as to when this feature will be available in QuickBooks Online (QBO). I’ll take note of this and let our engineering team know so they’ll consider adding this in the future. They're always looking for ways to improve our product to satisfy our customer’s needs.

In the meantime, you can visit our Apps store and look for a third-party app that integrates well with QBO and lets you add a QR code in your invoice. You can refer to the link shared by my colleague Jovychris_A above.

You can also go to the Apps menu in your QBO account and browse for an app from there. Additionally, I recommend checking our QuickBooks blog page from time to time. Here, you'll stay updated on the latest news and happenings in QuickBooks.

Also, allow me to add this article that can guide you through the complete process in case you need to refund your customer in the future: Record a customer refund in QuickBooks Online.

Let me know if there’s anything else I can help you with your QBO account. It’s always my pleasure to help you out. Have a nice day!