PlayFab Web callbacks

Hello everyone,
So I’m recently experimenting with PlayFab Party for voice chat, my end result should be a plugin that has an actor component, So I can inherit with Blueprints to setup PlayFab Party Sample!

While looking, I’ve found a PlayFabPartySample that’s made by Microsoft, So I thought of extracting the part that handles all the code in the background as DLL, which I succeeded on doing, Now I’ve been trying to make the functions to bind for the web callbacks…

Those are the expected functions callbacks!

This how they’ve done it in c#,
image

Delegate declaration!
image

Function call!

I’m trying to replicate all of this in Unreal engine code, I have prepared all the functions, I’m struggling with the expected type, I always get the same error no matter what type I put!
"Cannot convert argument to ‘OnPlayerJoinedCallback’ " Same goes to the rest of the functions!

My unreal attempt:

Anyone have an idea on how to do the functions calls?