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by jwhitlark 988 days ago
There are multiple GDSs, and AFAIK neither Expedia nor Booking.com use them. The space is way more confused and competitive then your comment implies. The best writeup I've seen on the space is https://www.altexsoft.com/blog/hotel-api/, if you really want to dive into the details.

Edit: been typing markdown all day, oops.