Does my game need to run the Gangster Legends engine to be listed?
No, any game can be listed on the GL directory!
How does the voting callback work?
When you send a user to the website to vote you send two parameters, the User ID and a Key.
Once the user has voted If the key matches the User ID we will send a request to your server with the User ID and a different key, there you can check that those two keys match if they do you can reward the user.