I am successfully running a query to grab analytics data from the API, but the result of impressions is slightly lower to what I is reported in the Twitter Ads dashboard. The URL being queried is:
And the result for daily impressions (derived) is reported as follows (dashboard results in brackets):
I'm not sure why this is happening. I have confirmed the derived metric is the sum of promoted_tweet_search_impressions, promoted_tweet_timeline_impressions and promoted_tweet_profile_impressions. I have also looked through all other metrics to try to find the missing data but there doesn't seem to be anything there.