WhatsApp payment feature: You can send money by scanning QR codes
By: Team Ifairer | Posted: 27-03-2018
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To do this, a user needs go to Settings, then tap on Payments> New Payments and Scan QR code. Once there, the user will then be directed to a QR code scanning option that first asks you for the amount, followed by the UPI PIN.
source: firstpost.com