Scan To Pay in 2 Minutes

Key Takeaways

[Music] hi welcome to another system design video in this video we'll discuss scan to pay this method of payment is available via digital wallet apps like PDM PayPal and vimo by scanning a dynamically generated QR code at the point of sale terminal how does it work let's take a look to understand how it works we need to divide the scan to pay process into two parts the first part is for the merchant to generate the QR code and display it on screen the second part is for the consumer to scan the QR code and pay let's take a look at the steps for generating the QR code when we're ready to pay the Cashers clicks the check out button the cashier's computer sends the total amount and Order ID to the payment service provider the PSP saves this information to the database and generates a QR code URL the PSP Returns the QR code URL to the Kia's computer the cashier's computer sends the ql code to the checkout terminal the checkout terminal displays the QR code all these steps complete within a second now the consumer pays from the digital wallet by scanning the QR code and here are the steps involved the consumer opens the digital wallet app and scans QR code the total amount to pay is displayed in the app after confirming the amount the consumer clicks the pay button the wallet app notifies the PSP that the given QR code has been paid the PSP marks the QR code AS paid and returns a success message to the wallet app the PSP notifies the merchant that the consumer has paid the given QR code this is how to pay using a dynamic QR code it is dynamic because the QR code is generated for onetime use it is also possible to pay by scanning the printed QR code at the merchant this is called Static QR code it works a bit differently and we might cover it in a different video if you like to learn more about system design check out our books and Weekly Newsletter Please Subscribe if you learn something new thank you so much and we'll see you next time