Yes. To add a webhook in the Hub, go to Settings > Channels and click New webhook.
Once added, you can choose what event you want to receive webhooks for. To trigger the webhooks, just perform a transaction and take one of the actions you enabled. For example, if you chose the `payment_refunded` event, just perform a refund and you will get a webhook.
Find out more about the events for which you can create webhooks.