# linkToReferrer(referrer)

Link a user to a given referrer - this creates a relationship between the two on ChainVine, allowing us to attribute rewards to the referrer based on the user's activity

```typescript
const 
campaign = { id:
'your-campaign-id'
,}

const 
referrer = getReferrer();
//Or manually fetch from URL if not using cookies

if
 (referrer) {
  
await 
userClient
    .referral({ campaign })
    .linkToReferrer(referrer);
}
```

## Params

| Param       | Required | Type   | Description                                            |
| ----------- | -------- | ------ | ------------------------------------------------------ |
| campaign.id | required | string | the  id of the program/campaign requirement belongs to |
| referrer    | required | string | the referrer to link the user to                       |

## Examples

{% tabs %}
{% tab title="Browser" %}

```typescript
import { ChainvineClient, getReferrerId } from '@chainvine/sdk';

const userWalletAddress = '0x293kdo0ij0';
const campaignId = 'siojdp2no';
const 
referrer = getReferrer();
//Or manually fetch from URL if not using cookies

const client = new ChainvineClient(); //Make sure to whitelist your domain

const userClient = await client.syncUser(userWalletAddress);
const referralUrlResponse = await userClient
  .referral({ campaign })
  .linkToReferrer(referrer);
```

{% endtab %}

{% tab title="Server" %}

```typescript
import { ChainvineClient } from '@chainvine/sdk';

const userWalletAddress = '0x293kdo0ij0';
const campaignId = 'siojdp2no';
const 
referrer = 'abc123';

// Generate your ChainvineClient instance
const client = new ChainvineClient({
    apiKey: '0dj03j000d'  // Your API Key
});

const userClient = await client.syncUser(userWalletAddress);
const referralUrlResponse = await userClient
  .referral({ campaign })
  .linkToReferrer(referrer);
```

{% endtab %}
{% endtabs %}