Objective :

• implement QR codes generation and function for transfer operations between merchants and customers and P2P.

There are different types of QRs for the ewallet

• when desigining the QR, we need to map the random generated qrId to the merchant or user id, to prevent malicious attacks. Also backend will process when receive the qrId.
• second is the QR should have an expiry time, for payments. but for merchants to display meaning a receive money QR, there should be no time limit.

Use Cases

1. Merchant Payment QR (P2M)

Purpose: Pay a business

• You scan merchant QR
• Money goes user → merchant
• Often supports:
  • fixed amount QR
  • dynamic amount QR (entered at checkout)

2. P2P Transfer QR (Person-to-Person)

Purpose: Send money to another user

• You scan friend’s QR
• user → user transfer
• Usually tied to:
  • userId / walletId
  • phone number alias