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

# Send Rewards (Client)

> Instructions for sending rewards to users directly from the client using the ZBD Earn SDK.

# Reward Unit

In the ZBD Earn SDK, rewards are sent as **units**. A **unit** is a **configurable value** determined by your ZBD Customer Success Manager and can represent different amounts, such as **1 satoshi** or **\$0.10**.

For example, if the game is configured so that **1 unit = 1 satoshi**, sending 1 reward will send 1 satoshi. Conversely, if the game is set up so that **1 unit = \$0.10**, sending 1 reward will send the equivalent of \$0.10 in satoshis.

**Your games config** could also be set up so that **a unit would represent a point in your game**, e.g. sending **1 unit** would send **1 "Gem"** which is worth **\$0.10**.

# Sending Rewards

To send a reward to a user you can call:

```csharp theme={null}
ZBDController.Instance.SendReward(1, callback =>
{
  if (callback.success)
  {
    // reward sent
  }
  else if (callback.maintenance)
  {
    // Platform is in maintenance mode
    Debug.Log("Rewards are temporarily unavailable. Please try again later.");
  }
  else
  {
    Debug.LogError("send reward error " + callback.message);
  }
});
```

The `SendReward` response object contains the following fields:

```csharp theme={null}
public class ZBDSendRewardResponse
{
    public bool success;
    public string message;
    public bool needsAuthentication;
    public bool maintenance;
    public ZBDTransactionData[] data;
}
```

<Warning>
  Maintenance mode can start while players are actively in a session. Even if `Init` succeeded normally, `SendReward` can return `maintenance = true` at any point during gameplay. Always check the `maintenance` flag on every reward call and display a user-friendly message when it is active. Do not queue or retry rewards during maintenance.
</Warning>

See [Handling Maintenance Mode](/earn/sdk/integration#handling-maintenance-mode) for the full list of affected methods.

<Note>
  For enhanced security and validation, we recommend handling reward distribution from your backend server.
</Note>

You can learn how to set this up in the **[Server Rewards Overview section](/earn/sdk/send-rewards-server)**