POST /oauth/access_token HTTP/1.1
Host: api.discogs.com
Content-Type: "application/json"
Authorization: OAuth oauth_consumer_key="REDACTED",oauth_token="REDACTED",oauth_signature_method="HMAC-SHA1",oauth_timestamp="1412093173",oauth_nonce="XZkGVd",oauth_version="1.0",oauth_signature="REDACTED"
User-Agent: "Whatever"
Cache-Control: no-cache
Content-Type: application/x-www-form-urlencoded