...
Access to the Analytics service is managed through API key pairs, which will be supplied to you when your Dashboard is commissioned, or when requested through the Support Portal.
What Are They Used For?
The primary purpose of the API keys is to allow the custom collector which you configure in your script, to talk with the simple analytics service collector, configured by BlinkMobile for your Dashboard project. Theoretically, you could have multiple simple analytics service collectors configured, as each collector uses its own unique API key pair.
...