### 获取账户余额
GET http://95.40.65.4:8081/admin/cs340item/checkMerchantBalance HTTP/1.1

### 查询库存
POST http://95.40.65.4:8081/admin/cs340item/queryOnSaleInfo HTTP/1.1
Content-Type: application/json; charset=UTF-8

{
    "marketHashName": "10 Year Birthday Sticker Capsule"
}