Use Authy and Twilio to verify your user's account.
Clone this repository and cd into the directory then.
$ bundle install
$ rake db:create db:migrate
$ export AUTHY_API_KEY=your authy key
$ export TWILIO_ACCOUNT_SID=your account sid
$ export TWILIO_AUTH_TOKEN=your auth token
$ export TWILIO_NUMBER=+16515559999
$ rake test
$ rails server
Then visit the application at http://localhost:3000/
Hit the button!