Postman to Unreal

Hello,

I would like to call up a function created in Blueprints, directly from Postman, in order to render a scene from the editor.
The function takes in 3 inputs, and while I include the input parameters from the Json call, I’ve added a validation bool (bSuccess) which, returns false.

Is there anything missing, which needs to be included in the function call, besides the input parameters?
I’m experimenting as I’ve never used these Json calls from postman to UE before, so looking for assistance.

Thank you.