Hubspot / MightyCall Rest API Integration

We use HubSpot on Windows 10 and would like to integrate the MightyCall api for outbound dialing etc. Here's the link to the API documentation. Ask any questions you may have. This is needed urgently to replace RingCentral, so if you cannot work on it right away it might not be the project for you.
https://api.mightycall.com/v4/doc