% cf. http://oauth.net/core/1.0/#rfc.section.9.4.1

{signature, "djr9rjt0jd78jf88&jjd99%24tj88uiths3"}.

{consumer, {"", "djr9rjt0jd78jf88", plaintext}}.

{token_secret, "jjd99$tj88uiths3"}.