数据类型：Merchandise
{
"merchandise_id": "NFH837824432",
"category_1": "3c",
"category_2": "phone",
"category_3": "android",
"name": "huawei phone",
"count": 1,
"unit_price": {
"currency": "CNY",
"amount_local": 6800,
"amount_usd": 1000,
"amount_cny": 6800
}
}