Can anyone recommend me an API for travel booking that includes flight and hotel fares worldwide? I already searched through the internet but found nothing (some, but doesn't exactly fit my needs). And also have searched several discussion that couldn't bring me anywhere such as;

What travel sites release their API? I am having a hard time searching

Need Hotel/Flight API's that return XML or API

The one that I need is similar to or Can anyone recommend me the API source that is reliable enough to perform equally to those website? but not affiliate network (Expedia etc), it should be integrated smoothly in the website without third party search brand.

Currently I found, they provide API for a cost, has anyone has tried their service? Or another API service provider you have tried?

Much appreciated.