## Get Started

**Use our sandbox environment during development** So you can easily test purchases, subscriptions, cancellations and refunds to automatically trigger webhook events without spending a dime.

1. **Add new endpoint**  
   Head over to your organization settings and click on the `Add Endpoint` button to create a new webhook.

2. **Specify your endpoint URL**  
   Enter the URL to which the webhook events should be sent.

3. **Choose a delivery format**  
   For standard, custom integrations, leave this parameter on **Raw**. This will send a payload in JSON format. If you wish to send notifications to a Discord or Slack channel, you can select the corresponding format here. Polar will then adapt the payload so properly formatted messages are sent to your channel.  
     
     
   If you paste a Discord or Slack Webhook URL, the format will be automatically selected.

4. **Set a secret**  
   We cryptographically sign the requests using this secret. So you can easily verify them using our SDKs to ensure they are legitimate webhook payloads from Polar. You can set your own or generate a random one.

5. **Subscribe to events**  
   Finally, select all the events you want to be notified about and you’re done 🎉

**Developing locally?**  
   Install Polar CLI to use the listening command. This will allow you to test your webhook handlers without deploying them to a live server.  
   Install the Polar CLI

Terminal
   ```bash
   curl -fsSL https://polar.sh/install.sh | bash
   ```
   Once you have installed the Polar CLI, you can easily start a tunnel:

Terminal
   ```bash
   polar listen http://localhost:3000/
   ```
   This will relay webhooks automatically to the specified URL.
   
   ```
   ✔ Select Organization …  My Organization
   
     Connected  My Organization
     Secret     6t3c8ce2247c493a3ade20uea4484d64
     Forwarding http://localhost:3000
   
     Waiting for events...
   ```
   
   [Now, it’s time to integrate our endpoint to receive events →](/content/docs/integrate/webhooks/delivery/index.html)