Hello Ansel,
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.
Response code 415 indicates that the Content-Type header is either missing or is not set to "application/json" within your request.
Response Codes - 415: Unsupported Media Type
https://v3.developer.constantcontact.com/api_guide/glossary_responses.html#415-unsupported-media-type
If you are unable to resolve this, could you please provide us with the full request(s) where you are receiving the error response (including URL, headers, timestamp, and request 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 and reference case 31988694.
Please have a look and let us know if you have any other questions!
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