What is an API key
API key is an identity of your LiveAgent (like your username and password) which you can use to build your own custom integration solutions. Never give it to anybody you don't trust. If your API key is lost, do not hesitate to generate a new one! Anybody with your API key can fully access your LiveAgent.
How can I get my API key
While logged in as an admin navigate to Configuration> System> API which loads the API v3 section where you find existing API keys or ...