docs: def get_participant(participant_id):
      """Get the participant with the given id."""
      try:
          ppt = models.Participant.query.filter_by(id=participant_id).one()
      except NoResultFound:
          return error_response(
              error_type="/participant GET: no participant found",
              status=403)
  
      # return the data
      return success_response(field="participant",
                              data=ppt.__json__(),
                              request_type="participant get")