mcc id vs customer id

[rafal]

Hi

Is there any way to validate customer id in order to find out whether
that is cusotmer or mcc number before that user authorizes my mcc?
I know it can be done once accounts are linked, but it is not the
case.

[AdWords API Advisor]

Hi Rafal,

It isn't possible to figure out whether an account is advertiser
account or mcc account just by looking at the customerid. As you
mentioned, it can be done once your accounts are linked, but not
otherwise.

Cheers,
Anash P. Oommen,
AdWords API Advisor.