I saw two other posts opened with the same error message but they did not provide sufficient information. I'm using the ruby wrapper for Constant Contact: auth = ConstantContact::Auth::OAuth2.new( api_key: <key>, api_secret: <secret>, redirect_url: <return_url> ) Then I get the autorization url: auth.get_authorization_url I'm going through the OAuth2 flow. And then I'm redirected to my application. So far so good. When I try: auth.get_access_token(<code>) I get the "Invalid verification code" error. Any tips on what may be happening here?
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