Sorry for the confusion. You're currently a Datafeedr Factory subscriber.
The Factory service and API service are 2 separate services.
To use the Datafeedr Factory service you don't need an API plan.
The plugin to use is available here: http://www.datafeedr.com/download/
You can find our Set-Up Guide here: http://www.datafeedr.com/docs/item/15
We also have a full library of Video Tutorials here: http://www.datafeedr.com/videos/