item_fee - 获得1688商品快递费用

item_fee - 获得1688商品快递费用

测试网址：注册送淘宝/天猫商品详情接口

Result Object:
---------------------------------------
{
	"item": {
		"num_iid": "534409796654",
		"area_id": "2274",
		"location": null,
		"shipping_to": "新余",
		"express_fee": "",
		"ems_fee": "",
		"post_fee": "",
		"freightTemplateId": null,
		"price": null,
		"beginAmount": null,
		"unitWeight": null,
		"memberId": null
	},
	"error": "data error,no cache",
	"reason": "data error,no cache",
	"error_code": "5000",
	"cache": 0,
	"api_info": "today: max:",
	"execution_time": 0.2,
	"server_time": "Beijing/2020-07-05 09:50:01",
	"call_args": {
		"num_iid": "534409796654",
		"area_id": "2274"
	},
	"api_type": "1688",
	"translate_language": "zh-CN",
	"translate_engine": "google_cn",
	"request_id": "15f0131c8deff8"
}