async def METHOD_NAME(self, pool_handle, _did, cred_def_id):
    print(f"##{self.moduleName}.get_cred_def()")
    get_cred_def_request = await ledger.build_get_cred_def_request(_did, cred_def_id)
    get_cred_def_response = \
        await self.ensure_previous_request_applied(pool_handle, get_cred_def_request,
                                            lambda response: response['result']['data'] is not None)
    return await ledger.parse_get_cred_def_response(get_cred_def_response)