> ## Documentation Index
> Fetch the complete documentation index at: https://devdocs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# DeliveryOption

> Reference for the DeliveryOption enum in the Unity PlayFab Party SDK, selecting best-effort or guaranteed reliability for multiplayer network messages.

The type of delivery guarantee for a message.

## Syntax

```csharp theme={null}
public enum DeliveryOption
{
    BestEffort,
    Guaranteed
}
```

## Constants

| **Constant**   | **Description**                                                   |
| -------------- | ----------------------------------------------------------------- |
| **BestEffort** | The message is sent without reliability or sequential guarantees. |
| **Guaranteed** | The message is guaranteed to arrive and in the correct order.     |


## Related topics

- [PlayFabMultiplayerManager.Get().SendDataMessage](/services/playfab/multiplayer/networking/unity-party-api-reference/classes/playfabmultiplayermanager/methods/playfabunitysenddatamessage.md)
- [PlayFabMultiplayerManager.Get().SendChatMessage](/services/playfab/multiplayer/networking/unity-party-api-reference/classes/playfabmultiplayermanager/methods/partyunitysendchatmessage.md)
- [PlayFab Party Unity SDK](/services/playfab/multiplayer/networking/unity-party-api-reference/index.md)
- [Transport options](/services/playfab/multiplayer/networking/transport-options.md)
- [PartyMessageReceivedOptions](/services/playfab/multiplayer/networking/reference/enums/partymessagereceivedoptions.md)