This setting allows you to define one or more authentication keys for autologin code.
For security reasons, autologin auth keys are separate from HTTP POST auth keys, since autologin auth keys are visible in links.
For best security practices you should not reuse, or tie your autologin auth keys to your Infusionsoft API key, or to your HTTP POST auth keys.
You can define multiple auth keys by separating each one with a comma. This makes it easy to transition from one key to another by having multiple active keys at once.