按照文档的说明，使用沙箱环境时，不需要充值运费就能生成订单：

https://developers.weixin.qq.com/miniprogram/dev/platform-capabilities/industry/express/business/intracity_service.html#_2-8-%E5%88%9B%E5%BB%BA%E9%85%8D%E9%80%81%E5%8D%95

但我尝试着生成订单，还是收到余额不足的错误：

{
  "errcode": 0,
  "errmsg": "ok",
  "request": {
    "invoke_time": 1691636215,
    "cost_in_ms": 1211,
    "request_url": "access_token=71_打码打码LgZxWCjkaJtIP打码打码",
    "request_body": {
      "use_sandbox": 1,
      "wx_store_id": "4000打码打码000000打码打码",
      "store_order_id": "testing_h8zj_打码打码_w1_o4",
      "user_openid": "om打码打码VSNwvu打码打码",
      "user_lng": 110.打码36,
      "user_lat": 21.打码874,
      "user_address": "打码打码打码打码打码打码",
      "user_name": "打码打码",
      "user_phone": "18012345678",
      "order_seq": "T08100255U1R2208",
      "order_detail_path": "打码打码/pages/home/index?id=1&q=打码打码x%3Fid%3D4",
      "cargo": {
        "cargo_name": "T08100255U1R2208",
        "cargo_weight": 1000,
        "cargo_type": 99,
        "cargo_num": 1,
        "cargo_price": 650000,
        "item_list": [
          {
            "item_name": "打码打码",
            "count": 10,
            "item_pic_url": "https://打码打码.打码打码.打码打码/打码打码.jpg"
          }
        ]
      }
    },
    "response_body": {
      "errcode": 934013,
      "errmsg": "Insufficient Balance， Charge Store First rid: 64d451f6-6d96a5b1-6f366b9e"
    },
    "client_ip": "打码打码"
  }
}

是不是得充值了才能进行下单测试？测试订单会真的扣钱吗？`use_sandbox` 这个值是无效的吗？