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2. QR code - Wikipedia

   en.wikipedia.org/wiki/QR_code

   The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [5] [6] [7] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [8] the pattern of position detection was found and determined by applying the least-used ratio (1:1:3 ...

3. Mobile payment - Wikipedia

   en.wikipedia.org/wiki/Mobile_payment

   QR code is a square two-dimensional bar code. QR codes have been in use since 1994. [48] Originally used to track products in warehouses, QR codes were designed to replace the older one-dimensional bar codes. The older bar codes just represent numbers, which can be looked up in a database and translated into something meaningful.

4. Google Authenticator - Wikipedia

   en.wikipedia.org/wiki/Google_Authenticator

   The Google Authenticator app for Android was originally open source, but later became proprietary. [8] Google made earlier source for their Authenticator app available on its GitHub repository; the associated development page stated: "This open source project allows you to download the code that powered version 2.21 of the application.

5. Alipay - Wikipedia

   en.wikipedia.org/wiki/Alipay

   Alipay is used in smartphones with their Alipay Wallet app. QR code payment codes are used for local in-store payments. [24] The Alipay app also provides features such as credit card bill payments, bank account managements, P2P transfer , prepay mobile phone top-up, bus and train ticket purchases, food orders, vehicles for hire , insurance ...

6. Digital wallet - Wikipedia

   en.wikipedia.org/wiki/Digital_wallet

   A digital wallet, also known as an e-wallet or mobile wallet, is an electronic device, online service, or software program that allows one party to make electronic transactions with another party bartering digital currency units for goods and services. This can include purchasing items either online or at the point of sale in a brick and mortar ...

7. Unified Payments Interface - Wikipedia

   en.wikipedia.org/wiki/Unified_Payments_Interface

   Unified Payments Interface, commonly referred to as UPI, is an Indian instant payment system as well as protocol developed by the National Payments Corporation of India (NPCI) in 2016. The interface facilitates inter-bank peer-to-peer (P2P) and person-to-merchant (P2M) transactions. [ 1][ 2] It is used on mobile devices to instantly transfer ...