I get most of my online bookings through channels like Airbnb/Expedia/Booking.com/Viator. Are they distributors on your system?
Yes. These are what is termed Online Travel Agents (OTAs) available for you to connect to via TXA. These are typically distributors that take payment and manage the customer. TXA automatically delivers your rates and availability to OTAs and places OTA bookings back into your booking system.