Query Regarding Targeting specific CriterionUserInterest (interests and remarketing) - Positive campaign targeting

Hi,

I am using google ad words API(PHP) for running campaigns on Google Display Network.

I can't see any way to target CriterionUserInterest (interests and remarketing).

Although I can do negative campaign targeting for the same by setting userInterestId (i.e. excluding what all interests not to target) but that won't allow me to run the campaign as it shows Weekly available impressions equal to none.

For running on display network, you need to choose user interests but I can't figure out how to  explicitly target on specific interests like Sports Fans(90200), Music Lovers(91900) or all the available interests (across all categories) using Adwords API

I will appreciate immediate help or some pointers on this (I have already gone through the available documentation).

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