You can add the plugin capabilities to WordPress Rest-API using this extension.
All of the plugin features are available as an individual method, which you can access them conveniently at following URL and connect your application to it.

http://yourdomainname.com/wp-json/wpstatistics/v1

Once installed, go to the Dashboard -> WP-Statistics -> REST API page and assign a security code for authentication.

Soon, the mobile application of the plugin will be designed and developed, which requires installing the add-on on WordPress.