the big issue here is the auth that they use for Hatz X-api instead of bearer auth. you can use the HTTP call in N8N to get some of what you need and to call apps as said above but there is another request for bearer auth that you should upvote for better integration.

if you pre-build the hatz app and get the app id, you can use the API in n8n, node-red, etc. to pass info to/from the app. It works well.