> For the complete documentation index, see [llms.txt](https://developer.magtek.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.magtek.com/programmers-resources/programmers-resources/sdk-programmers-manuals/universal-sdk-magtek-devices-programmers-manual-android/iconfigurationcallback-delegates.md).

# IConfigurationCallback Delegates

MTUSDKNET API will invoke the callback function in this chapter to provide the requested data and/or a detailed response. These events will be called in a class that implements the IConfigurationCallback Delegates interface.

## OnCalculateMAC

This event is called when certain asynchronous IDeviceConfiguration operations need to be have a MAC included with the request.

**Copy**

```csharp
IResult OnCalculateMAC( 
    byte macType, 
    byte[] data);
```

| Parameter | Description                                 |
| --------- | ------------------------------------------- |
| macType   | Type of Mac algorithm. For DynaFlex, use 0. |
| data      | Contains the data of the payload to MAC.    |

**Return Value:**

Returns an IResult that contains the calculated MAC.

## OnProgress

This event is called to update the host on the progress of an asynchronous IDeviceConfiguration operation.

> `public void OnProgres(int progress);`

| Parameter | Description                                                   |
| --------- | ------------------------------------------------------------- |
| progress  | The progress of the configuration operation. Range: `0 - 100` |

**Return Value:** None

## OnResult

This event is called to update the host when an asynchronous IDeviceConfiguration operation is completed.

**Copy**

```csharp
public void OnResult( 
    StatusCode status, 
    byte[] data);
```

| Parameter | Description                         |
| --------- | ----------------------------------- |
| status    | An enumerated Library Status Codes. |
| data      | Contains the data for the event.    |

**Return Value:** None

**Example:**

**Copy**

```csharp
class OnConfigCallbackClass implements IConfigurationCallBack
{
    public IResult OnCalculateMAC(byte macType, byte[] data)
    {
        // Event handler
    }

    public void OnProgress(int progress)
    {
        // Event handler
    }

    public void OnResult(StatusCode status, byte[] data)
    {
        // Event handler
    }

}

OnConfigCallbackClass configCallBack = new OnConfigCallbackClass();
```

For the complete documentation index, see [llms.txt](https://developer.magtek.com/llms.txt). This page is also available as [Markdown](/programmers-resources/programmers-resources/sdk-programmers-manuals/universal-sdk-magtek-devices-programmers-manual-android/iconfigurationcallback-delegates-1.md).


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