How do I send a POST Request to Sharepoint

Hey all,

I'm trying to create an Action following a survey being submitted that sends a POST web service request to an internal SharePoint site. I've already configured a bearer token and whatnot. The problem I'm running into is that in *Postman* I can just construct the body (JSON ) to be the following:
{ "Title": "Some random title"}
and it will post fine to the list. When I come over to Qualtrics and use the same two headers for accept and content-type I get lost at the body. I pass in "Title" = "Some random title" (which then Qualtrics removes the quotes) but then on survey completion, the item is never pushed to the SP list. Is there something I'm missing? I've also tested this with https://reqbin.com/ and it posts fine so clearly I must not be putting the right body in this request for qualtrics.