Open the Whatsapp app on your phone and send the below text to the given phone number : Message: I allow callmebot to send me a message
Then you will receive the API Key
Enter the API key in the field beside and also enter the Phone number.
Click on Send OTP.
Enter One Time OTP which you received on the Whatsapp app and Click on Verify Code.
The setup has been done successfully. miniOrange also provides backup codes to get back to your account, in case you lost your two-factor authentication ability you can use those backup codes to get back to your WordPress account.
Click the Finish button.
So after this setup whenever the user tries to log in to your WordPress account, the user needs to verify his identity with OTP Over Whatsapp as two-factor authentication.