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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. WhatsApp - Wikipedia

    en.wikipedia.org/wiki/WhatsApp

    WhatsApp Web's user interface is based on the default Android one and can be accessed through web.whatsapp.com. Access is granted after the users scan their personal QR code through their mobile WhatsApp application. There are similar solutions for macOS, such as the open-source ChitChat, previously known as WhatsMac.

  4. FreeOTP - Wikipedia

    en.wikipedia.org/wiki/FreeOTP

    FreeOTP. FreeOTP is a free and open-source authenticator by RedHat. It implements multi-factor authentication using HOTP and TOTP. Tokens can be added by scanning a QR code or by manually entering the token configuration. It is licensed under the Apache 2.0 license, and supports Android and iOS. [4] [5] [6]

  5. Turning a US Covid Vax paper record into a QR code - Cairo ...

    www.tripadvisor.com/ShowTopic-g294201-i9404-k...

    Then I found a (free) online QR Code Generator software to create a QR code linked to the PDF document and added it to my printed copy of the PDF document. So the QR code is basically the same as my printed document, but with some additional information that I added --- address of Walgreens location where I obtained my vaccine.

  6. Qr code madeirasafe - Madeira Forum - Tripadvisor

    www.tripadvisor.com/ShowTopic-g189166-i434-k...

    When I click on the QR code it says " Head for the dark green line" September 1, 2021. Date of Registration: June 26, 2021. Validated documents exist. The date on the QR code updates when I log on. Hopefully then all seems to be ok but I will take copies just to be sure. Not sure if this helps the OP but it has cleared my mind by writing it all ...

  7. QR Code on PCR Test - Tanzania Forum - Tripadvisor

    www.tripadvisor.com/ShowTopic-g293747-i9226-k...

    Helen-we leave a few weeks after you. I read up on QR code creation websites yesterday and seems pretty simple. Question for you: regarding departure from TZ back to the US: do you understand that we will be required to PCR test AND rapid test with 6 hrs of our flight despite the US only requiring us to rapid test within one day??

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