我们在 Android 的应用内购买消息流的最后部分看到“服务不可用”错误，我们不知道为什么。
我们已经实现了 Android 的应用内计费，并且一切运行良好，我们几乎可以通过消息序列获得所有信息：
1) 我们发送 REQUEST_PURCHASE 消息并返回 RESPONSE_CODE 为 0
2) 我们收到 com.android.vending.billing.IN_APP_NOTIFY
3) 我们发送 GET_PURCHASE_INFORMATION 消息并返回 RESPONSE_CODE 0
4) 我们收到 com.android.vending.billing.PURCHASE_STATE_CHANGED
5）我们发送的是CONFIRM_NOTIFICATIONS。
我们查看了 Google 提供的示例应用程序 (com.android.vending.billing)，它表示我们必须在 CONFIRM_NOTIFICATIONS 消息中提供的只是通知 ID 的字符串数组。我们从最后一条消息收到的响应是 BroadcastReceiver 中的 com.android.vending.billing.RESPONSE_CODE 消息，其中包含响应代码值 2（映射到“服务不可用”）。为什么我们会从最后一条消息中收到错误消息？我们正在使用静态项目 ID android.test.purchased，如果这有影响的话。
Android 日志消息是：
06-29 14:20:12.054：调试/iapReceive（21391）：通知，notificationId android.test.purchased
06-29 14:20:12.054: DEBUG/iapSend(21391): 发送带有notificationId android.test.purchased 的GET_PURCHASE_INFORMATION
06-29 14:20:13.994: DEBUG/iapReceive(21391): inapp_signed_data 是 {"nonce":5454,"orders":[{"notificationId":"android.test.purchased","orderId":"transactionId. android.test.purchased","packageName":"com.shinyandroid","productId":"android.test.purchased","purchaseTime":1309382399381,"purchaseState":0}]}
06-29 14:20:13.994: DEBUG/iapReceive(21391): 购买状态改变，notificationId android.test.purchased，SKU android.test.purchased
06-29 14:20:13.994: DEBUG/iapSend(21391): 发送带有notificationId android.test.purchased 的CONFIRM_NOTIFICATIONS
06-29 14:20:14.845: DEBUG/vending(18344): [51] RequestRunnable.run(): Got ApiException from async request: Error from backend. 请求=com.android.vending.model.AckNotificationsRequest，响应=BAD_REQUEST
06-29 14:20:16.104: DEBUG/vending(18344): [51] RequestRunnable.run(): GotApiException from async request: Error from backend. 请求=com.android.vending.model.AckNotificationsRequest，响应=BAD_REQUEST
06-29 14:20:18.274: DEBUG/vending(18344): [51] RequestRunnable.run(): Got ApiException from async request: Error from backend. 请求=com.android.vending.model.AckNotificationsRequest，响应=BAD_REQUEST
06-29 14:20:20.824: DEBUG/vending(18344): [51] RequestRunnable.run(): Got ApiException from async request: Error from backend. 请求=com.android.vending.model.AckNotificationsRequest，响应=BAD_REQUEST
06-29 14:20:26.854: DEBUG/vending(18344): [51] RequestRunnable.run(): Got ApiException from async request: Error from backend. 请求=com.android.vending.model.AckNotificationsRequest，响应=BAD_REQUEST
06-29 14:20:26.854: WARN/vending(18344): [51] AsynchInAppAckNotifications.onException(): InAppAckNotificationsRequest 上的服务器错误: com.android.vending.api.ApiException: 来自后端的错误。请求=com.android.vending.model.AckNotificationsRequest，响应=BAD_REQUEST
06-29 14:20:26.904：调试/iapReceive（21391）：异步响应代码，requestId 5225550415890630760，responseCodeIndex 2