QR code. To generate a QR code, it is necessary to use the content of the uri
parameter, which you received in your response when creating the invoice: "uri":"bitcoin:3Gtvf2EVxN8XJ4DHriRt9q9LkdVCpQZEeSd?amount=0.010268"
The QR code allows customers to make payments using a mobile device if the wallet is installed on it. The customer simply scans the QR code and the device opens the wallet with an automatically pre-filled payment destination address, which is a rather convenient method in the UX context