How to complete FATCA? Where can I get a GIIN number?

Question

Law in IT

To work with the US, they say that you need to fill out a FATCA form. There, among the fields, you need to enter GIIN. And where to get it? Register with the US tax office? And how to register there? Do I need to complete W8BEN-E first?
Required to work with Google.

Answer 1

Read here
and here