import json

data = {}
for key in ['template_id', 'rule_type', 'rule_config', 'enabled', 'sort_order', 'remark']:
    val = params_kw.get(key, None) if hasattr(params_kw, 'get') else None
    if val is not None:
        data[key] = val

result = await create_voucher_rule(data)
return json.dumps(result)