Interface needed between Rezdy and Sling

We use Sling (getsling.com) to manage our employees schedules. We use Rezdy (Rezdy.com) to manage our tour bookings. Need an interface programmed between the two so when a tour gets booked on Rezdy, it populates that tour as a shift in Sling. Ability to add and match fields between interfaces essential for future growth and tour options.