Hello Arild, 

thank you for your message. 

If you get an html code which you can integrate you can do this by using the Html Code Object on one of your pages.

Alternatively, you should have a look at the optional Object Bookeo to manage online booking, which you can find on our Marketplace: market.websitex5.com/en/objects/live-preview/37d744d8-1b56-41fa-a249-10736bf1bfc 

Please let me know if I can be of further help. Kind regards.