Hi,
If your API classes are written in PHP and you're using windows, then I have a pretty good idea of what the problem is.
If it's not what I'm thinking initially that it shouldn't be an issue to get your APIs working.
I work with various APIs all day long and written loads in PHP.
Just to quickly check the issue: When you send a post request (or get request, even) - the data you're getting back from the server is empty?
Thanks a lot,
John