AdWords API blog has announced that the AdWords API Version 9 (V9) has been launched. There are four major changes and few minor changes as well.  

V9 HIGHLIGHTS
Support for Video Ads: You can now create and manage click-to-play video ads for both keyword- and site-targeted campaigns (video upload not supported via the API)
Local Time Zone Statistics: Now all calls return statistics in the account's local time zone (we have removed the inPST parameter)
Batch Check Ads: Before you try to insert or update ads, you can now check a batch of ads for policy errors.

For a detailed overview of V9 see the release notes.

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