The BookingSync PHP SDK by BookingSync communicates with the API to access booking and syncing data, useful to implement in vacation rental applications. Resources include usage and installation. Examples demonstrate how to authorize, get rentals, and update rentals from the official web service.
How much will it cost to hire that cabbie? The Yourtaximeter API gives access to such precise data that cab companies in the UK rely on it to give quotes. Yourtaximeter provides a tool anyone can use to calculate a fare. The API documentation, other than providing a link to where you can get an access key and noting responses are flexibly delivered in JSON or XML, is rather skimpy. That's actually a complement: minimal documentation reflects the fact that no coding skills are required.