请求参数

<table> <thead> <tr> <th>参数名</th> <th>说明</th> <th>必选</th> <th>类型</th> </tr> </thead> <tbody> <tr> <td>mer_no</td> <td>商户号</td> <td>是</td> <td>String</td> </tr> <tr> <td>biz_content</td> <td>请求参数密文</td> <td>是</td> <td>String</td> </tr> <tr> <td>sign</td> <td>对报文摘要的签名</td> <td>是</td> <td>String</td> </tr> </tbody> </table>