api: https://api.weixin.qq.com/shop/spu/update_without_audit

requestBody:

{"out_product_id":"31222","path":"pages/fission/index?out_product_id=1234569","skus":[{"out_sku_id":"1024","sale_price":13000,"market_price":15000,"stock_num":2,"barcode":"13251454","sku_code":"A24525252"}]}

请求该接口成功响应数据为

{"errcode":0,"data":{"product_id":0,"out_product_id":"","skus":[{"out_sku_id":"1024"}],"update_time":"1970-01-01 08:00:00"}}

product_id 和 update_time明显为缺省值，返回这样的数据含义是什么