Get all approvals on a request, for a given request ID/Key

        :param issue_id_or_key: str
        :param start: OPTIONAL: int
        :param limit: OPTIONAL: int
        :return:

def get_approvals(self, issue_id_or_key, start=0, limit=50):
        """
        Get all approvals on a request, for a given request ID/Key

        :param issue_id_or_key: str
        :param start: OPTIONAL: int
        :param limit: OPTIONAL: int
        :return:
        """
        url = 'rest/servicedeskapi/request/{}/approval'.format(issue_id_or_key)
        params = {}
        if start is not None:
            params['start'] = int(start)
        if limit is not None:
            params['limit'] = int(limit)

        return self.get(url, headers=self.experimental_headers, params=params).get('values')