Are payment links used for promotions? Can I send a QR code for a sale item in an email or on our social media to get orders?

Hey there, @Harry4. 

It's great to see you back in the Community! 

I can see how beneficial this could be for you and your business. However, QR codes aren't allowed on invoices at this time. With the being said, I recommend submitting your feedback to our Product Developers so they can consider this feature in the near future. Here's how: 

1. Go to the Gear icon in the top right-hand corner. 
2. Press the Feedback option. 
3. Enter your suggestions. 
4. Tap Next to submit your suggestions. 

I hope this helps answer your questions. I'm only a post away if you need me again. Have a great day!