Looks like a copy-paste error. On https://wiki.fitbit.com/display/API/OAuth+2.0
Implicit Grant flow
Fitbit follows the OAuth 2.0 Authorization Code Grant as specified in RFC 6749.
-> links to http://tools.ietf.org/html/rfc6749#section-4.2 Implicit Grant
The header and link are correct, but the text "Authorization Code Grant" is incorrect there. This is the section on *Implicit* *Grant*.
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