# Integrating with Customer.io

Learn how to connect Emailable to Customer.io.

Connect Emailable to Customer.io to verify email addresses within your workflows and automatically identify and unsubscribe undeliverable contacts. 

## **Set up API Key**

To integrate Emailable with Customer.io, you'll need to create a Private API key. Head over to the API Page.

\[API Key for customer.io.png\]
Once you've created your API key, you'll be redirected back to the API Page, and you should see a table that includes your newly created API key.

\[customer.io API key created.png\]
## **Set up a webhook in Customer.io**

In Customer.io, you'll create or edit an existing campaign. The webhook step is part of the campaign's workflow.

1\. Start by adding a webhook to your workflow.

\[Screenshot 2026-04-23 173244.png\]
Now that you've created a webhook, click it, and the sidebar should open. 

Click the Add Request button.

2\. Set up the Request

You should now see a section with three tabs. (Request, Response, and Preview)

\[customer.io - 2.jpg\]
```
Type: POST

URL: https://api.emailable.com/v1/verify?email={{customer.email}}&api_key=YOUR_API_KEY
```

Make sure to replace **YOUR\_API\_KEY** in the URL above with your API Key.

3\. Set up the Response

Now, click the Response tab, then click the Set up an attribute button.

\[customer.io - 3.jpg\]
For our use case, we decided to map the following response data to the following fields

```
emailable_state: {{response.state}}
emailable_reason: {{response.reason}}
emailable_free: {{response.free}}
unsubscribed: {% if response.state == 'deliverable' %}false{% else %}true{% endif %}
emailable_unsubscribed: {% if response.state == 'deliverable' %}false{% else %}true{% endif %}
```

You can review your attribute mappings and add any others you would like by reviewing the test response.

Click the "Send test..." button in the top-right corner.

\[customer.io - 4.jpg\]
## **Conclusion**

You've now set up Customer.io webhooks to verify email addresses using Emailable.

Emailable automatically unsubscribes people with undeliverable email addresses.

\[customer.io - 5.jpg\]
For all email campaigns, you'll want to set this webhook as the first step in their workflows.