ClientLogin authentication support for the AdWords API
will sunset along with v201309 on July 21st, 2014. But it doesn’t mean you should wait till the last minute to migrate!
We have plenty of resources to
help you migrate. It might take longer than expected to migrate to OAuth2, especially if you don't already use a single top-level MCC to manage your AdWords accounts.
Start your migration as soon as possible and reach out to us early on the
AdWords API Forum with any questions.
- Ray Tsang, AdWords API Team