There’ve been many questions posted to the AdWords API forums regarding the new Shared Budgets feature that was introduced into the AdWords API in version v201209. To help, we’ve put together an FAQ which you can find
here.
To aid migration, we've also re-introduced the v201206 behavior that allowed the mutating of budgets via the CampaignService. After v201209 this functionality will be removed.
If you can’t find the answer to your specific question, please post it on the
forum or attend one of the
AdWords API Office Hours Hangouts. You can also follow our
Google+ page for updates about the AdWords API.
- Mandy Waite, AdWords API Team