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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. 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 ...

  4. WeChat - Wikipedia

    en.wikipedia.org/wiki/WeChat

    WeChat or Weixin in Chinese ( Chinese: 微信; pinyin: Wēixìn ( listen ⓘ); lit. 'micro-message') [a] is a Chinese instant messaging, social media, and mobile payment app developed by Tencent. First released in 2011, it became the world's largest standalone mobile app in 2018 [4] [5] with over 1 billion monthly active users.

  5. 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.

  6. 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.

  7. Help:Two-factor authentication - Wikipedia

    en.wikipedia.org/wiki/Help:Two-factor_authentication

    In "Step 2" of the setup page, there is a box with a pattern which you have to point your device's camera toward. (Your device might ask you for permission to use the camera first.) If you can't scan the QR code, you can enter the "Two-factor authentication secret key" from "Step 2" of the setup page into the app, which gives you the same result.

  8. QR decomposition - Wikipedia

    en.wikipedia.org/wiki/QR_decomposition

    QR decomposition. In linear algebra, a QR decomposition, also known as a QR factorization or QU factorization, is a decomposition of a matrix A into a product A = QR of an orthonormal matrix Q and an upper triangular matrix R. QR decomposition is often used to solve the linear least squares (LLS) problem and is the basis for a particular ...

  9. 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 ...

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