I have fixed this after going through lots of trial and error. Please update the documentation, especially when it comes to OAuth when no user authorization is needed.
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I'm trying to sync data from my server to constant contact and send campaigns. I do not need users to approve my application, but the OAuth in the Constant Contact API requires that I have a redirect URL for a user to grant access to my application. This is very frustrating because I just want server-to-server communication and no clients should approve it, but that's that the new API requires!
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