Hi J Yang, You can use the PLACEHOLDER_FEED_ITEM_REPORT <https://developers.google.com/adwords/api/docs/appendix/reports/placeholder-feed-item-report> to track the performance (e.g. Clicks) of your Ad extensions. Although, for you to identify your Ad extension, you'll have to use the FeedItemId <https://developers.google.com/adwords/api/docs/appendix/reports/placeholder-feed-item-report#feeditemid> and/or the AttributeValues <https://developers.google.com/adwords/api/docs/appendix/reports/placeholder-feed-item-report#attributevalues> column as this attribute pertains to your Ad extension fields (e.g. sitelink's link text). You may check this reporting basic guide <https://developers.google.com/adwords/api/docs/guides/reporting> and sample reports <https://developers.google.com/adwords/api/docs/samples/java/reporting> in Java (also available in other languages) for reference.
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