> **应用场景**: > 本地查询云端储值卡额余额 字段信息: | 名称 | 说明 | 类型| 示例 | 是否必传字段 | | --- | --- | --- | --- | --- | service_name |接口名称 |String |query_prepay_card_balance |是 data_target |上传位置 |String| 固定为cloud| 是 card_id|储值卡会员编号(收费系统唯一编号)| String| 2017081000 |是 car_number| 车牌| String |京GH0093 |是 random_str |随机字符串 |String| 123sf| 是 > 示例: > {"service_name":"query_prepay_card_balance","data_target":"cloud","card_id":"京A111111-001","car_number":"冀A111111","random_str":"1"} 方法调用返回: | 名称 | 说明 | 类型| 示例 | 是否必传字段 | | --- | --- | --- | --- | --- | state |状态 |Number| 0失败1成功| 是 errmsg |方法返回描述 |String| 查询余额成功 |是 service_name |接口名称| String |query_prepay_card_balance |是 card_id |储值卡会员编号(收费系统唯一编号) |String |2017081000 |是 park_id| 车场编号| String| 21782 |是 balance| 储值卡余额| String| 100| 否(state为1必传) random_str |随机字符串| String| 123sf| 是,原值返回 > 示例: > {"balance":"1","service_name":"query_prepay_card_balance","park_id":"21782","errmsg":"查询余额成功!","state":1,"random_str":"1","card_id":"京A111111-001"}