docs: def authorize(self, client_id, redirect_uri, scope, 
                    state=None, user_name=None, user_email=None):
          """Documentation: `/oauth2/authorize
          <https://www.wepay.com/developer/reference/oauth2#authorize>`_.
  
          .. note::
      
             This is not an API call but an actual uri that you send the user to.
  
          """
          query = [
              ('client_id', client_id),
              ('redirect_uri', redirect_uri),
              ('scope', scope)
          ]
          if user_name is not None:
              query.append(('user_name', user_name))
          if user_email is not None:
              query.append(('user_email', user_email))
          if state is not None:
              query.append(('state', state))
          return '%s/oauth2/authorize?%s' % (
              self._api.browser_endpoint, urllib.parse.urlencode(query))