| http://www.w3.org/ns/prov#value | - Fixing this problem meant two things (a) After the user types in their username and password, Twitter appends a query-string parameter (oauth_verifier) to the callback URL. This oauth-Verifier value needed to be retrieved from the URL. (b) The oauth_verifier needed to be included in the HTTP headers of the /oauth/access_token request.
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