Step 1 - Get an API key
Go to the LIFX Cloud settings page and generate a key. See the GIF below for a quick video tutorial.
Step 2 - Use that API Key in the documentation
At the bottom of the API Endpoint pages there is a section that allows you to test the API. If you click the key, paste your token in, and save it you can then test the API against your own account. See the GIF below for a quick video tutorial.