Each individual user on ECGrid has their own API key. This can be found by clicking on My Profile and at the bottom under Access Information.
Network and Mailbox Admins also have access to all API keys for each user in their applicable network or mailbox. These can be found under Management/Users on the left side navigation panel, then choosing the correct User profile and looking under the Access Information section towards the bottom of the page. By clicking on the eye next to the API key, you can see the key in plain text.
Once you have your API/Session ID, you have access to execute all calls in the full ECGridOS API library.