We recently launched our own fully integrated reservation manager and online booking system. For further information on our reservation manager and booking system follow this link: https://promotemyplace.zendesk.com/hc/en-us/articles/115001245532-PromoteMyPlace-Reservation-Manager-Online-Booking-System
Alternatively, we've created our templates to allow for easy integration with 3rd party booking software in a number of ways.
Our recommended 3rd party booking software providers are:
Instructions on how to add 3rd party software to your website can be found here: https://promotemyplace.zendesk.com/hc/en-us/articles/216229703