# 5.Channel exclusive allocation
## 5.1 AP

| Parameter | Type       | Required | Description                                                  | Sample                                 |
| --------- | ---------- | -------- | ------------------------------------------------------------ | -------------------------------------- |
| timeout   | String(10) | O        | The default is 12h. Please contact Alipay Technical Support if you need to use other values. Max value is 15d. This parameter controls the valid time from login to completion. | 5m 10m 15m 30m 1h 2h 3h 5h 10h 12h 1d. |