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

{
    "errcode": 0,
    "errmsg": "ok",
    "brands": 
    [
        {
            "first_cat_id": 123,
            "second_cat_id": 123,
            "third_cat_id": 124,
            "brand_info": 
            {                
                "brand_id": 0,
                "brand_name": "测试"
            }
        }
    ]
}