> For the complete documentation index, see [llms.txt](https://docs.notcentralised.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.notcentralised.com/sdk/service-bus.md).

# Service Bus

The guide walks you through the process from importing necessary libraries to adding and retrieving event values.

Firstly, import the required libraries:

```typescript
import { NotVault, ServiceBus } from '@notcentralised/notvault-sdk';
```

### Instructions

1. **Instantiate the NotVault and ServiceBus classes:**

```typescript
const vault = new NotVault();
const servicebus = new ServiceBus(vault);
```

The `NotVault` instance is required to initialize the `ServiceBus` class, which manages events in the confidential service bus.

2. **Define the Key and Confidential Value:**

```typescript
const key = BigInt(1);
const confidentialValue = BigInt(2);
```

The `key` and `confidentialValue` are BigInt values. You may replace `1` and `2` with any integers of your choice.

3. **Add an event value:**

```typescript
await servicebus.setValue(key, confidentialValue);
```

You can add an event value to the confidential service bus by calling the `setValue()` method. It requires two parameters: the key and the confidential value.

4. **Get an event value:**

```typescript
const retrievedConfidentialValue : BigInt = await servicebus.getValue("... Wallet Address ...", key);
```

You can retrieve the event value from the confidential service bus using the `getValue()` method. It requires two parameters: the wallet address and the key. It will return the confidential value associated with the given key.