Booking.com Integration

We are building a booking system in PHP and we want to integrate into [login to view URL] and make a so-called Channel Manager. Though, with a big system and only a few hands, we need someone to help us with the integration. It's required that you have worked with their API before and also have good knowledge with PHP since that's the language that'll be used. I hope that instead of you having access and trying to learn our systems, you'll make the integration in a PHP class(es), that we can import and use in our systems. So if you have worked with [login to view URL] before, this task should be relatively easy. We will need all the functions that we can use from the API in the class, so we easily in our system can call and use these. It would also be a good thing and more work if you have knowledge with any of these other companies doing the same thing as [login to view URL] 1. [login to view URL] 2. [login to view URL] 3. Airbnb 4. Trivago