The list of API endpoints and manual testing can be done at:
To Authorize access and manually interact with the API, follow these steps:
Login to your account as an administrator, click Integrations from the top right account menu.
Get the ClientId (API Key) and ClientSecret (API Secret) keys.
Click the [Authorize] button.
Enter the account keys and and click the [Authorise] button to login.
Use the [Try it out] button for each endpoint to make the relevant requests.
To logout, click the [Authorize] button, then click the [Logout] button
Each endpoint provides the payload/parameters required, the expected results and error codes.