'Associate an authorization verifier with a request token.
:param token: A request token string.
:param verifier A dictionary containing the oauth_verifier and
oauth_token
:param request: An oauthlib.common.Request object.
We need to associate verifiers with tokens for validation during the
access token request.
Note that unlike save_x_token token here is the ``oauth_token`` token
string from the request token saved previously.
This method is used by
* AuthorizationEndpoint'

def save_verifier(self, token, verifier, request):

    raise NotImplementedError(u'Subclasses    must    implement    this    function.')
