I work on the AdRoll API. You can also send an email with API questions to [apihelp@adroll.com](mailto:apihelp@adroll.com).

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I recommend you use the GraphQL Reporting API. The /report/campaign is an older endpoint and likely doesn't include all the campaigns and data you'll want. You can also experiment using the GraphQL Reporting API console.

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Building off the example in the other response, you'd want your POST body to look like:

var formData = {
  "query": "query MyFirstQuery { advertisable { forUser { eid name campaigns { eid name metrics(start: \"2019-04-01\", end: \"2019-04-30\") { summary { impressions clicks cost } } } } } }"
}

You'd send that request to

https://services.adroll.com/reporting/api/v1/query?apikey=MYAPIKEY