Groundhogg provides a RESTful API that allows users to retrieve data remotely using a JSON format. Using the RESTful API users can manage contacts, emails, SMS and tags remotely.
By default, Groundhogg enables its REST API. If you want to disable it you can do that from Groundhogg->Settings->API page.
Groundhogg registers different endpoints using which you can use to communicate with Groundhogg. To
Here you can see new namespace is added which is "gh/v3/". The Groundhogg API provides direct access to admin methods thus, authentication is an inevitable part of using the API.