How can QR codes help with online payment?
Nowadays, people do not think twice before paying for even small purchases on-line. Typically, they scan a QR code, which takes you to a payment portal. What happens next? The Unified Payments Interface (UPI) app on your mobile phone allows you to transfer money from your bank to the seller's bank. While most UPI apps need you to have an active internet connection it is possible to pay offline. The QR code enables you to access the payment system to complete the transaction. While a UPI app is much more than the QR code used to access it, a QR code is also much more than just a gateway to a UPI app! Now you can ask, how does the UPI work? Well, that’s a story for another day!
Sources:
https://www.sproutqr.com/blog/how-do-qr-codes-work;
https://www.geeksforgeeks.org;
Wikipedia;
Google Gemini AI