General Questions

Hello this is Emre from Turkey. I cant get some parts of buying or using this plugin.I am a web developer and I want to use your plugin. But is it free to use for us on our websites or any licence cost like we pay on codecanyon or themeforest?Do we have to pay monthly or annual? Or any other things we need to pay?So it is free as soon as if we do all customazations by ourselves?Could you please tell me about these? So all I want to find out what should I pay to use these system on my page fully?Thank youEmre