Hello user416572,
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.
It sounds like you may be trying to execute the OAuth2 authorization behind the scenes, as I am not seing any authorization requests within our logs for your key.The Authorization Request screen can only be accessed/authorized via a browser window or a pop up browser dialog, but you should only need to authorize/connect each account once via this method.
If you continue to run into issues, please reach our team directly/securely via email at webservices@constantcontact.com and reference case #32983566 and provide us with 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.
Please have a look and let us know if you have any other questions!
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