Error 400 connecting with PostGrid API

I am trying to use the API Connector to connect to PostGrid’s Verify a Structured Address endpoint. The specific error:
{“status”:“error”,“message”:“InvalidRequestError: Expected ‘address’ in body.”}
However, I have copied directly from the documentation. My supervisor took a quick look at it and told me to try here. He said specifically, look into “URI encoding without JSON request body.”

Any ideas?

Is there any header for the call ?

yes, the x-api-key with a value of my generated key. (I got a valid response from an axios call in Nodejs)