Please see this video on how to use this labapp and potentials of Lightning Flow https://www.youtube.com/watch?v=G5q6jiBkqoI
Step 1 - Please get your Authy key from Twillio.com
Step 2 - Go to this Visualfroce page and update Authy key that is stored in managed package's custom settings.
/apex/CmdUpdate .
e.g. Following is a sample URL .
https://phoneveritesting-dev-ed--phoneverify.gus.visual.force.com/apex/CmdUpdate
Step 3 -
From Setup, run the flow "PhoneVerifyUI" manually
Step 4 -
Integrate the managed Flow actions e.g. in Chatbot, Flow UI etc