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https://en.wikipedia.org/wiki/One-time_password
https://searchsecurity.techtarget.com/definition/one-time-password-OTP
https://www.techopedia.com/definition/10301/one-time-password-otp
https://www.cm.com/blog/what-is-otp-one-time-password/
https://www.cm.com/products/access/one-time-password/
https://www.bdo.com.ph/faqs/otp-faqs
https://medium.freecodecamp.org/how-time-based-one-time-passwords-work-and-why-you-should-use-them-in-your-app-fdd2b9ed43c3
https://www.infobip.com/en/glossary/otp-one-time-pin-code
https://www.drupal.org/project/otp_verification
https://developers.gigya.com/display/GD/SMS+Login+-+OTP
https://www.facebook.com/help/214309978590084?helpref=uf_permalink
https://lastpass.com/support.php?cmd=showfaq&id=4616
https://www.quora.com/How-does-the-OTP-one-time-password-work