Go to https://www.unifonic.com/ and register an account.
Complete the required field in the plugin general settings.
To recover the REST API key, please follow the steps below:
1- Navigate to the Unifonic site, URL: “http://software.unifonic.com/“.
2- From the left menu choose Dev Tools
3- From Dev Tools choose API Apps
4- Click on Create new app
5- Choose app type REST
6- Choose app name and add description
7- Click save