Hi erhan ,
Thanks for reaching out to us! I hope that you had a great weekend. 😃
There are a couple of ways you could integrate a booking calendar with Buttonizer.
Since we support popups, you can use pretty much any booking calendar WordPress plugins. You can integrate a booking calendar into a Popup Maker or Elementor Popup then make a Buttonizer button open the popup containing the booking calendar.
If you would like to use a third party booking calendar, Then you can use our built-in popup to show this by choosing "iframe widget" and simply copy and pasting the iframe url.
Hope this helps! 😄