## Source event

Stripe.js automatically creates a [Source](/api/sources.md) after the customer is done interacting with the browser’s payment interface.
To access the created source, listen for this event.

**Syntax:** `paymentRequest.on(...)`

- `event` (string) **required**
  The name of the event. In this case, `source`.

- `handler` (function) **required**
  A callback function that will be called with a [PaymentResponse](/js/appendix/payment_response.md) object when the event is fired.
The `PaymentResponse` object will contain a `source` field.

### Handle 'source' event

```js
paymentRequest.on('source', function(event) {
  // event.source is available
});
```

```es_next
paymentRequest.on('source', ({source}) => {
  // source is available
});
```