支付状态枚举

<table> <thead> <tr> <th>状态值</th> <th>状态解释</th> </tr> </thead> <tbody> <tr> <td>0</td> <td>支付中</td> </tr> <tr> <td>1</td> <td>支付成功</td> </tr> <tr> <td>2</td> <td>支付失败</td> </tr> <tr> <td>3</td> <td>支付关闭</td> </tr> <tr> <td>4</td> <td>退款中</td> </tr> <tr> <td>5</td> <td>退款成功</td> </tr> <tr> <td>6</td> <td>其他</td> </tr> </tbody> </table>