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

{
    "errcode": 0,
    "errmsg":"ok",
    "data": {
        "company_list":
        [
            {
                "delivery_id": "SF",
                "delivery_name":"顺丰速运"
            },
            {
                "delivery_id": "YTO",
                "delivery_name":"圆通快速"
            },
            {
                "delivery_id": "ZTO",
                "delivery_name":"中通快速"
            },
            ...
        ]
    }
}