Audacious

Hi everyone!
I want to make a plugin for Audacious which is playing music from vk.com (social network). I looked over all plugin sources and still can't figure out how to write a plugin. But I got the main idea, so I kept consistency with the existing plugins as much as I can.
Here is the source code - https://github.com/VladX/audacious-vk-plugin
I already wrote everything that's related to fetching info and constructing perf. window. I just need help to turn all this into a plugin.
Sample program located in test.cpp. It shows window and prints all info about playlists to stdout. Plugin have to open new tab for each given playlist and play each song in playlist by URL.

P.S. Since Audacious is already using GTK, I implemented all networking stuff using libsoup. Code has no other dependencies except libsoup and GTK3.
someone pls help