I am having a similar strange problem. My setup and redirects are all proper. What youre referring to as step 4 - exchange code for tokens (header) Authorization Basic api_key:client_secret (base64 encoded) https://idfed.constantcontact.com/as/token.oauth2?code=(authorization_code)&redirect_uri={encoded redirect_uri}&grant_type=authorization_code ----------------------------- This is what Im getting back from the server. There is a # symbol instead of the query string ? that is supposed to be there which is preventing me from getting the code from the URI without parsing it which I shouldnt have to. https://mydomain.com/constant3.php#access_token=SNLrLESU8j15QKeQKVWgR0j3wway&token_type=Bearer
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