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2. QR code - Wikipedia

   en.wikipedia.org/wiki/QR_code

   Whereas a barcode is a machine-readable optical image that contains information specific to the labelled item, the QR code contains the data for a locator, an identifier, and for web-tracking. To efficiently store data, QR codes use four standardized modes of encoding: (i) numeric, (ii) alphanumeric, (iii) byte or binary, and (iv) kanji. [4]

3. 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.

4. vCard - Wikipedia

   en.wikipedia.org/wiki/VCard

   MeCard is a variation of vCard made by NTT DoCoMo for smartphones using QR codes. It uses a very similar syntax, but in a more consolidated way as the storage space on QR codes is limited. It's also limited in the amount of data that can be stored, not just by the standard but the size of QR codes.

5. WhatsApp - Wikipedia

   en.wikipedia.org/wiki/WhatsApp

   WhatsApp also began rolling out support for sending login codes to a linked email address, rather than via SMS. [176] In a later update on November 30, WhatsApp added a Secret Code feature, which allows those who use locked chats to enter a unique password that hides those chats from view when unlocking the app. [177] [178]

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 ...