How can I view bookings made through Google Hotel Ads / Trivago / Trip Advisor / Meta Search on my site?

Go to Booking Engine and select Reports > View Bookings

Under the filters, choose the date range required and under MARKETING FILTER, select the platform you want to see the bookings for. 

You will be able to see statistics regarding the bookings, i.e. total number, revenue etc, as well as a list of the bookings and the option to export as an excel spreadsheet.