# Pass UTMs to Lemon Squeezy Checkout

## UTM attribution overview

Lemon Squeezy UTM Tracking Integration only records UTMs that land on the checkout URL at purchase time. UTM Grabber keeps them in cookies on your site. This page explains how to pass that data through before the customer pays.

### What to expect

Checkout URLs can include custom data params.

### Steps

1. Pass custom data query params from handl\_utm

### Append UTMs with utm-out

```
<a href="https://your-checkout-url.example/product" class="utm-out">Buy now</a>
```

UTM Grabber rewrites the link with cookie values. Details: [utm-out class guide](https://docs.utmgrabber.com/books/102-getting-started-for-handl-utm-grabber-v3/page/appending-utms-to-the-buttons-using-class-name-attributes-selectively).

For webhook-based attribution after purchase, see [Send Lemon Squeezy UTMs via Webhook](https://docs.utmgrabber.com/books/lemon-squeezy-integration/page/end-emon-queezy-s-via-ebhook).