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Construct a new OAuth 2 protocol client.
:param session: Requests session object to communicate with
authorization server.
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:param token_endpoint_auth_method: client authentication method for
token endpoint.
:param revocation_endpoint_auth_method: client authentication method for
revocation endpoint.
:param scope: Scope that you needed to access user resources.
:param state: Shared secret to prevent CSRF attack.
:param redirect_uri: Redirect URI you registered as callback.
:param code_challenge_method: PKCE method name, only S256 is supported.
:param token: A dict of token attributes such as ``access_token``,
``token_type`` and ``expires_at``.
:param token_placement: The place to put token in HTTP request. Available
values: "header", "body", "uri".
:param update_token: A function for you to update token. It accept a
:class:`OAuth2Token` as parameter.
:param leeway: Time window in seconds before the actual expiration of the
authentication token, that the token is considered expired and will
be refreshed.
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