ACTIVE Net System APIs require you to specify the API version in the hostname in the URL:
https://api.amp.active.com/anet-systemapi/orgtest/api/v1/activities?activity_status_id=1&activity _id=1234&api_key=1234567890xn3xnteudxsavw
ACTIVE Net System APIs will be regularly updated to provide more features and data.
New versions of the API will be published only when the changes break backward compatibility.
Older API versions will continue to be available, unless they must be retired due to technical reasons.
Retrieving data from ACTIVE Net