How to use the php api?

Good afternoon. I program in php. I would like to access the exchange through your api. Before that, I traded on another exchange in the same way, the api was simple and clear there, but it’s hard to figure it out, you need help. I understand that some kind of file is needed, it connects everywhere - vendor/autoload.php . What is it and how to download it? I don’t understand. Help please.

Please feel free to check this open source PHP library that can be used for most spot endpoints. It can be installed in your application, and many methods are available to call directly.