Can't get API results to show up in my code
 

I'm sure this will come down to some misunderstanding on my part.

I can make an API call to my store and get the results to show up in my browser window and in Postman. But when I try to make the call using some C++ code I wrote I get an HTTP response code of 200 but I don't get the JSON as I expected to.

When testing my code with a placeholder API like https://jsonplaceholder.typicode.com/posts
It works just fine.

Am I missing something obvious? Is the xCart API different somehow?

If anyone has more experience than me and could help me out I would be greatly appreciative.