API Connect with Aftership

If anyone has a few moments to spare, I would be really grateful for a few pointers in the right direction.
I’m trying to add a track shipment page. I have created a free account at https://www.aftership.com created an API Connect with my aftership-api-key:
But cannot seem to bind any data to screen.

I set my initial url as https://api.aftership.com/v4 and can fetch the schema.
I can also fetch https://api.aftership.com/v4/trackings with the query parameters as per the screenshot attached.

Screenshot 2018-11-10 at 08.16.00.jpg1735×1111 199 KB

I am using the parcel-force demo tracking reference EK345618635GB

Thanks in advance.
Mim