http请求方式：POST
https://api.weixin.qq.com/product/store/get_shopcat?access_token=xxxxxxxxx

{}

{
    "errcode": 0,
    "errmsg":"ok",
    "shopcat_list": 
    [
        {
            "shopcat_id": 123,
            "shopcat_name": "食品",
            "f_shopcat_id": 0,
            "cat_level": 1
        },
        ...
    ]
}