Querying the system requires a valid API Key which can be created via the Settings > General Settings> API Key section of the Dashboard when logged on via a Superuser or (non-Classic) Administrator level access, a login with the required General permissions enabled or the Agent Key (where Dashboard access is enabled
Simply select Generate Key to create the API key.
The API Key may be generated as often as required with each generation overwriting the existing key.
To email the API key simply enter the recipient address in the Email API Key section and OK to send.
The email includes not only the API Key itself but also the respective server URL to query.
This key is used to authenticate against the Public API. If you generate a new key then anything that uses the existing key to authenticate against the Public API will stop working.