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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, or "quick response", bar codes were designed to contain the meaningful information directly in the bar code. QR codes can be of two main categories: [ 49 ] [ citation needed ] The QR code is presented on the mobile device of the person paying and scanned by a POS or another mobile device of the payee

  4. Reed–Solomon error correction - Wikipedia

    en.wikipedia.org/wiki/Reed–Solomon_error...

    The first element of a CIRC decoder is a relatively weak inner (32,28) Reed–Solomon code, shortened from a (255,251) code with 8-bit symbols. This code can correct up to 2 byte errors per 32-byte block. More importantly, it flags as erasures any uncorrectable blocks, i.e., blocks with more than 2 byte errors.

  5. Health Codes (Chinese mobile app group) - Wikipedia

    en.wikipedia.org/wiki/Health_Codes_(Chinese...

    Health Codes (Chinese mobile app group) Health Code ( Chinese: 健康 码, Jiànkāngmǎ) is [needs update] a type of application used during COVID-19 [1] in mainland China. It was used as an e-passport that reports if the user has been in an area with current cases of infection. An applicant provides information such as travel history ...

  6. Add or disable 2-step verification for extra security - AOL Help

    help.aol.com/articles/2-step-verification...

    4. Select Authenticator app for your 2-step verification method.-To see this option, you'll need to have at least 2 recovery methods on your account . 5. Click Continue. 6. Scan the QR code using your authenticator app. 7. Click Continue. 8. Enter the code shown in your authenticator app. 9. Click Done. Sign in with 2-step for authenticator app. 1.

  7. Barcode - Wikipedia

    en.wikipedia.org/wiki/Barcode

    Example Name Notes App Clip Code: Apple-proprietary code for launching "App Clips", a type of applet. 5 concentric rings of three colors (light, dark, middle). [46] AR Code: A type of marker used for placing content inside augmented reality applications. Some AR Codes can contain QR codes inside, so that AR content can be linked to. [47] See ...

  8. QR code payment - Wikipedia

    en.wikipedia.org/wiki/QR_code_payment

    A QR code payment is a mobile payment method where payment is performed by scanning a QR code from a mobile app. [1] This is an alternative to doing electronic funds transfer at point of sale using a payment terminal. [2] This avoids a lot of the infrastructure traditionally associated with electronic payments such as payment cards, payment ...

  9. Mobile marketing - Wikipedia

    en.wikipedia.org/wiki/Mobile_marketing

    They can take a user to the particular advertising webpage a QR code is attached to. QR codes are often used in mobile gamification when they appear as surprises during a mobile app game and directs users to the specific landing page. Such codes are also a bridge between physical medium and online via mobile: businesses print QR codes on ...