'Create and save a new request token.
:param request: An oauthlib.common.Request object.
:param credentials: A dict of extra token credentials.
:returns: The verifier as a dict.'

def create_verifier(self, request, credentials):

    verifier = {u'oauth_token': request.resource_owner_key, u'oauth_verifier': self.token_generator()}
    verifier.update(credentials)
    self.request_validator.save_verifier(request.resource_owner_key, verifier, request)
    return verifier
