Working with Google Docs: exporting documents via API?

Question

PHP

Guys, I have never worked with Google Doc API, I need help.
Are there ready-made PHP libraries that can be used to connect to your files and download them to your server?
That is, it is necessary that:
1. Someone uploads the document to the State Duma
2. The script will check if this is a new document, and then upload it to the server using the API.
Of course, I'm only interested in loading/unloading from the GD, you don't need to write a verification script (new document or not) :)
And what alternative methods are there in general?

Answer 1

There are examples in a dozen languages ​​(PHP too)
https://developers.google.com/drive/web/delegation