Hello user6365,
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.
The V3 API does not currently have an endpoint with the functionality that you’ve described. The 2 methods that Courtney listed above are currently the best options for obtaining contacts that have interacted with your campaigns, however, we greatly appreciate you reaching out to us with this request. It has been submitted for review and consideration by our engineering team. Your feedback and experience with this request is essential to improving our product, so thank you for reaching out to us regarding this matter.
Please let us know if you have any other questions!
Regards,
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