To access your campaign performance data via reporting API, you can create a report with necessary parameters as defined below.

Please note, once a report is created, you can re-use the same report to fetch latest data. For instance, if you create a report for duration as "Last 7 days" ("date_macro": "last_seven_days"), this will be a rolling window and will always fetch last 7 days data depending on when you query the report.