Thank you for responding 🙏 there might be some limit where it is big enough to scan but not too big where the curvature affects it. Could you guesstimate how big your qr code had to be to be functional? I will check etsy too and see. A qr code on a mug must be possible in 2024 haha 

https://i.nostr.build/XyQ4IIGs2pB2Mn6q.jpg
  

 I think it was around 1.5 inches by 1.5 inches. 1 *1 was too small. But all QR codes and wallets also are different. Worked with Muun but not strike. Sometimes individual innovations lead to non cross functionality.