# Add scheduled callbacks

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Let your customers request a scheduled callback in your app using the Zoom Contact Center SDK for iOS.

## Start the scheduled callback service

To start standard scheduled callback functionality, first [initialize the service](#initialize-the-standard-scheduled-callback-service), then fetch the service instance, and finally show the scheduled callback view.

To initialize the standard scheduled callback service, create an instance of the `ZoomCCItem` class to set the `sdkType` property to `ZoomCCIInterfaceType_ScheduledCallback`. Include the `apiKey` from your Contact Center flow.

```objectivec
ZoomCCItem *item = [ZoomCCItem new];
item.sdkType = ZoomCCIInterfaceType_ScheduledCallback;
item.apiKey = APP_SCHEDULE_CALLBACK_API_KEY;
```

```swift
let item = ZoomCCItem.init()
item.sdkType = .scheduledCallback
item.apiKey = APP_SCHEDULE_CALLBACK_API_KEY
```

Next, fetch the scheduled callback service instance and set its delegate to receive callbacks from `ZoomCCSDK`. When the status of the service is `ZoomCCSDKStatus_Initial`, initialize the scheduled callback service by calling `initializeWithItem:` and `login`. The callback service then connects to the Contact Center server to fetch information.

```objectivec
id<ZoomCCScheduledCallbackService> scheduledCallbackService = [[ZoomCCInterface sharedInstance] scheduledCallbackService];
scheduledCallbackService.scheduledCallbackDelegate = self;
if (scheduledCallbackService.status == ZoomCCSDKStatus_Initial) {
    [scheduledCallbackService initializeWithItem:item];
}
```

```swift
let scheduleService = ZoomCCInterface.sharedInstance().scheduledCallbackService()
scheduleService.scheduledCallbackDelegate = self
if (scheduleService.status == .initial) {
    scheduleService .initialize(with: item)
}
```

To show the standard scheduled callback view, use this callback. The callback gets the view's instance and displays it.

```objectivec
__weak typeof(self) wself = self;
[scheduledCallbackService fetchUI:^(UIViewController * _Nonnull viewController) {
    [wself directShow:viewController];
}];
```

```swift
scheduleService.fetchUI { vc in
if (vc != nil) {
        self.navigationController?.pushViewController(vc!, animated: true)
    }
}
```

## End the scheduled callback service

This method closes the view created by the SDK, then returns to the application view. The service instances created inside `ZoomCCSDK` are released after this method is called.

```objectivec
[scheduledCallbackService endScheduledCallback];
```

```swift
scheduledCallbackService.endScheduledCallback()
```

## Callbacks

These callbacks are available for scheduled callback functionality.

-   error
-   eventChange
-   loginStatusChanged

### `error`

Sent after a service error.

-   service - the current service.
-   error - the service error code. See [errors](errors) for details.
-   detail - the error details.

```objectivec
- (void)onService:(id<ZoomCCService>)service error:(NSUInteger)error  detail:(NSInteger)detail;
```

```swift
func onService(_ service: ZoomCCService, error: UInt, detail: Int) {
}
```

### `eventChange`

Sent when a change has occurred, such as when a user requests or cancels a scheduled callback.

-   service - the current service.
-   event - the event that occurred.

```objectivec
- (void)onService:(id<ZoomCCService>)service eventChange:(ZoomCCSDKEvent)event;
```

```swift
func onService(_ service: ZoomCCService, eventChange event: ZoomCCSDKEvent) {
}
```

### `loginStatusChanged`

Sent when the login status changes.

-   service - the current service.
-   status - the service status. `ZoomCCSDKStatus_Login` means the login succeeded.

```objectivec
- (void)onService:(id<ZoomCCService>)service loginStatusChanged:(ZoomCCSDKStatus)status;
```

```swift
func onService(_ service: ZoomCCService, loginStatusChanged status: ZoomCCSDKStatus) {
}
```