Hello EdR,
Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API.
If you are just looking for summary report rather than a detailed report which includes contact details, the most direct endpoint to use would be the Email Campaigns Summary Report:
V3 - GET an Email Campaigns Summary Report https://v3.developer.constantcontact.com/api_reference/index.html#!/Email_Reporting/getAllBulkEmailCampaignSummaries
Please have a look and let us know if you have any other questions!
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