HI Jianbo,

You can either use your option 1 (via 
ConstantDataService.getUserInterestCriterion() 
<https://developers.google.com/adwords/api/docs/reference/v201802/ConstantDataService#getuserinterestcriterion>)
 
or option 2 (via this table 
<https://developers.google.com/adwords/api/docs/appendix/codes-formats#in-market-categories>)
 
as both options should have the same data at the same time. However for the 
timing of the updates for this list, we do not have a specific timing for 
this. You are also correct that the list does not necessarily have the same 
timing on the release of an API version. What you need to do is just to 
regularly check the list via your option 1 or 2. 

Let me know if you have further clarifications.

Thanks,
Vincent
AdWords API Team

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