How can I embed Square Appointments into my booking form?

Is there a widget that I can use to put the code for square appointments into a booking form? 

You may use the Appointment Slots widget: https://widgets.jotform.com/widget/appointment_slots 

You can also check other similar options:

https://widgets.jotform.com/widget/multiselect_grid 

https://widgets.jotform.com/widget/date_reservation 

To add a widget to your existing form, please follow this guide: https://www.jotform.com/help/252-How-to-Add-a-Widget-to-Your-Form 

Let us know if you need more help.