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Re:Analyzing the Facebook ads placed by the US presidential ... by minimaxir on Saturday August 10, 2019 @04:21PM (#20664319)
How exactly did they get access to the Facebook Ad Library API? You need special permission for that: https://www.facebook.com/ads/library/api/

Also, per those docs, ad spend is a range; I'm not sure how the article infers exact values.

Re:Analyzing the Facebook ads placed by the US presidential ... by envy2 on Saturday August 10, 2019 @06:20PM (#20664826)
No, you don't, at least not in the sense of "Facebook approves your use case based on some subjective criteria."

Per the page you linked, as long as you verify your ID/location, are from one of the countries where the Ad Library has launched, and agree to the Facebook Platform Policy, you can get access.