First, create a stream where you would like to receive Greenhouse notifications and subscribe all interested parties to the stream. The integration will automatically use the default stream greenhouse if no stream is supplied, though you will still need to create the stream manually even though it's the default.

Next, go to the Zulip settings page and create a bot named Greenhouse. Go to the account settings page of your Greenhouse account and under Webhooks, add the below URL and name the integration, Zulip.

{{ external_api_uri_subdomain }}/v1/external/greenhouse?api_key=abcdefgh&stream=greenhouse

Note: api_key must be reconfigured to be the API key of your Zulip bot.
If you want to change the stream that receives notifications, change stream= in the URL.
To change the topic displayed by the bot, simply append &topic=name to the end of the above URL. Where name is your topic.

Congratulations! You're all set
Your messages should look like this: