param is a JSON-serialized string. The table below describes its decoded logical fields.| parameter name | required | type | description |
|---|---|---|---|
| timestamp | Yes | long | current timestamp |
| mchOrderId | Yes | string | merchant order ID, alphanumeric, max length 32 |
| startDate | Yes | string | payment start date(yyyy-MM-dd) |
| endDate | Yes | string | payment end date(yyyy-MM-dd) |