Greetings. Magento Owners!!
The OTP feature prevents some forms of identity theft by making sure that a captured user name/password pair cannot be used a second time using Magento 2 Mobile Login extension. Have a look at a complete tutorial at How to Add OTP Login for customers in Magento 2.
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Deep Dive Into: https://magecomp.com/blog/otp-login-magento-2/
