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Re:UPI: India's Unified Payments Interface by efitz on Sunday August 09, 2020 @12:50AM (#24097344)
> why not use that as the unique ID

Maybe I don't want to give people my phone number

Maybe I have multiple phones

Maybe I anticipate changing my phone number (maybe I hate my current carrier)

Maybe I want something easy for people to remember, or catchy "mybusinessname@mybank"

Forcing people to use a particular naming regime should only be done if there is a very compelling case for limiting your users

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