How do I find the immutable id of my Google Apps account?

Question

Many of the Directory API calls require a customer parameter referred to as the \"Immutable id of the Google Apps account. (string)\".

e.g. GET http

Answer 1

I was able to find the customerId as follows

1. Go to admin.google.com
2. Security -> Set up single sign-on (SSO)

You will see URLs like this:

https://accounts.google.com/o/saml2/idp?idpid=Cxxxxxxxx

That Cxxxxxxxx is your customerId