We recently 
deprecated the default namespace in the 
AdSense Management API so now you should show an account picker to your users and add an account ID to all requests.
The 
Accounts resource offers both a name and an ID but for most accounts these were showing the same string (something like "pub-12345678901234"). To make the process more intuitive for users, we are improving the logic behind the name.
From now on, the 
account.name property will have the 
company name or, in its absence, the 
contact name. If you still want to show the account ID, just use the id field.
This also applies to the 
Host API, although the default namespace can still be used.
As always, if you have any questions, feel free to drop us a line on our 
API forums.
 - Jose Alcérreca, AdSense API Team
 - Jose Alcérreca, AdSense API Team