Hello Miho,
You can use any account to create client ID and client secret. This is
normally the account you use for development, can be someone else's account
(like 3rd party developer etc).
The access is only defined by the account you've logged in on the consent
screen. You can use the
I have 2 AdWords account: A and B.
1. I created an application in *account A*, and i got ClientID and
ClientSecret.
2. I got the the AuthorizeUrl and i used it to go to the consent screen.
3. At the consent screen, i used email and password of *account B* to login.
4. The consent screen displayed
