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System Design: How Does a UPI Payment Reach the Chai Wala in Just Seconds?
揭秘UPI支付从付款到茶摊老板瞬间收款的全链路系统设计，技术干货满满。
Imagine this. You buy a ₹20 chai from your local chai wala. You open Paytm , scan his QR code, and make the payment. But here's the interesting part: …