linking oauth2 to blogger REST code

Hi
Using the php code library from Google I've managed to use the idtoken.php 
example script to successfully do an oauth2 login to my google account.

Using the Google API REST test/example system I've got a REST request to 
make a post to Blogger which makes a request but fails as I'm not 
authenticated - this I expect as it needs the API key.

Which bit of the token blob that comes back from the oauth2 login do I use 
as the API key when making the REST request?

None of the fields appear to be an API key and from the terminology it 
feels like I'm doing something wrong but if I am I can't work out what as 
everything says I must authenticate with oauth2 before making a post but I 
just can't tie the two things together.

Suggestions?

Robin

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