Use this property to set and retrieve your Eyes license key.
To obtain your API key, see How to obtain your API key.
config.apiKey = configval; configval = config.apiKey;
A string that is your API Key.
Set this immediately after the Eyes object is created (before calling open). If you have an environment variable called APPLITOOLS_API_KEY that is set to the value of your API key, then you do not need to call this method, and Eyes will take the string from the environment value.