What’s new?
The validation for 
AppConversions will become stricter starting on 
November 9, 2015. If you’re using 
AppConversions in v201509 or v201506 with 
AppPlatform: 
ITUNES, you’ll need to make sure that you’re using the correct 
AppConversionType.
What was the old behavior?
When v201509 was first released, the API would not throw an error if the incorrect value was sent in a request for an iTunes 
AppConversion. The API automatically converted to the correct 
AppConversionType. For example, if the value 
DOWNLOAD was passed into v201509 for an iTunes 
AppConversion, then that value would automatically be converted to 
FIRST_OPEN.
What is the new behavior?
In v201509, 
AppConversionType DOWNLOAD changed to 
FIRST_OPEN for iTunes apps. Here’s what you will need to do:
  - For v201506 or earlier, you must pass in AppConversionTypeDOWNLOAD rather than FIRST_OPEN.
- For v201509 or later, you must pass in FIRST_OPEN instead of DOWNLOAD.
Passing in the incorrect value will result in the error 
DOMAIN_EXCEPTION from the API starting on November 9.
Note: This only impacts iTunes conversions. There will be no changes to the validation for 
AppConversions with an 
AppPlatform of 
ANDROID.
Where can I learn more?
For more information on mobile apps and conversions, check out these guides:
Questions? Visit us on the 
AdWords API Forum or our 
Google+ page.
 Nadine Sundquist, AdWords API Team
 Nadine Sundquist, AdWords API Team