Recently we 
announced the ability to upload offline conversions back into AdWords. This 
conversion import feature allows you to see how clicks on your ads led to sales made in the offline world such as over the phone or via a sales rep. This feature is now available in 
v201309 of the AdWords API.
We have published a 
new guide that explains the API implementation of this feature in detail. We have also added support and code examples for this new feature in all our 
client libraries.
If you have any questions about this feature or the AdWords API in general, you can post them on our 
developer forum. You can also follow our 
Google+ page for updates about the AdWords API.
 Anash P. Oommen, AdWords API Team
Anash P. Oommen, AdWords API Team