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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. 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; the pattern of position detection was found and determined by applying the least-used ratio (1:1:3:1:1) in black ...

  3. WeChat - Wikipedia

    en.wikipedia.org/wiki/WeChat

    WeChat Business (微商) is one of the latest mobile social network business model after e-commerce, which utilizes business relationships and friendships to maintain a customer relationship. Comparing with the traditional E-business like JD.com and Alibaba , WeChat Business has a large range of influence and profits with less input and lower ...

  4. Barcode - Wikipedia

    en.wikipedia.org/wiki/Barcode

    Barcode. A UPC-A barcode. A barcode or bar code is a method of representing data in a visual, machine-readable form. Initially, barcodes represented data by varying the widths, spacings and sizes of parallel lines. These barcodes, now commonly referred to as linear or one-dimensional (1D), can be scanned by special optical scanners, called ...

  5. WhatsApp - Wikipedia

    en.wikipedia.org/wiki/WhatsApp

    Unlike their 32-person group calls, starting a voice chat doesn't call all group members directly; they instead receive a notification to join the voice chat. WhatsApp also began rolling out support for sending login codes to a linked email address, rather than via SMS.

  6. Unified Payments Interface - Wikipedia

    en.wikipedia.org/wiki/Unified_Payments_Interface

    For real-time payments from one bank account to another, any UPI client app can be used and multiple bank accounts can be linked to a single app. Money can be sent or requested using a user-created Virtual Payment Address (VPA) or UPI ID for each bank account using the KYC-linked mobile number. UPI also generates a specific QR code for each ...

  7. vCard - Wikipedia

    en.wikipedia.org/wiki/VCard

    vCard. vCard, also known as VCF (Virtual Contact File), is a file format standard for electronic business cards. vCards can be attached to e-mail messages, sent via Multimedia Messaging Service (MMS), on the World Wide Web, instant messaging, NFC or through QR code.

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