Topic: Integration of Hotel Reservation Engine with Ruby on Rails application

I am working on a quote for website hotel and am trying to figure out if/how I can address the different needs for it.

One of the obvious requirements is the integration of a booking engine, and I was wondering if anyone had a suggestion on what the best approach might be for it.
Does anyone have had a good experience with a 3rd party booking engine ( the hotel is based in Ireland, if that is of any relevance)?
Or is there any gem one might suggest?

Thanks a lot for any suggestion!