On Saturday, this TOI reporter accessed the new feature under the "settings" tab and set up a bank account link with UPI using the phone number linked to the bank account. When in a chat window, tapping the "attachments" button pulls up a small grid that gives one options to send files from the gallery, send a contact, or share location among others. This grid now also has a "Payment" button making it possible to transfer funds to other accounts that also have this latest update.
UPI is a digital inter-bank peer-to-peer fund transfer system developed by the National Payments Corporation of India (NPCI). The NPCI has its own UPI-enabled payments app called BHIM.