Hello user84168,
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.
Could you please email our team with the API key that you are using to make the request, the full request(s) where you are receiving the response (including URL, headers, timestamp, and request body), and the full response body so that we can better assist you in identifying the root cause of the issue?
You can reach our team directly/securely via email at webservices@constantcontact.com
Please have a look and let us know if you have any other questions!
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