Add friends: scan a user's QR code to add them as a friend. You can scan directly with camera or choose a QR image from your album.
Scan payment QR code: support scanning a user's personal payment QR code.
What can I do with the Scan button (top-right)?
Use the top-right Scan button to scan user QR codes (camera or album) to add friends, and scan user payment QR codes.
