import json

params = params_kw if hasattr(params_kw, '__getitem__') else {}
data = {}
for key in ['name', 'code', 'face_value', 'total_count', 'valid_days', 'status', '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_template(data)
return json.dumps(result)