Singapore Quick Response Code (SGQR) is the world's first unified payment QR code. It combines multiple payment QR codes into a single SGQR label, making QR payments simple for both consumers and merchants. Consumers just need to look out for the SGQR label to see which payment options a merchant accepts, while merchants only need to display one SGQR label instead of many labels.

Indicatethe technologies that support SGQR e-payment. You should clarify the function of each technology and its role in SGQR to support your answer.