The developer who created this API documentation deserves a special place in HTTP hell. They've somehow managed to make status codes even more confusing by inventing their own bizarre numbering system.
Standard HTTP has nice, clean codes like 200 (OK), 404 (Not Found), and 500 (Server Error). But this madlad decided "200 OR 1000" means success? And what's with all those 1000+ codes that read like someone's therapy session? "Room Rates field cannot be null or empty" isn't a status code—it's a passive-aggressive note from your micromanaging coworker.
This is what happens when you let someone design an API after they've been rejected from the HTTP standards committee. Next they'll be telling us 418 (I'm a teapot) is too mainstream and replacing it with "2077: Brewing device self-identifies as kettle."