You will simply be able to place banners and searchboxes onto the site containing the link to the Parent Partner site (ie, Expedia.com, booking.com and hotelscombined.com etc) There is no such customizations involved and customers are routed to the Parent Partner site once clicked on the banner. Its the easiest and Cost effective solution for affiliates. You can consider it similar to Google Ads
As we don't have access to the source code of Flights and Hotels in whitelabeling, we are only left with the oppertunity to play with color combinations whereas some whitelabeling product may not be mobile friendly. Oppositely, API based websites will be mobile compatible to any screens (ie, Laptop, Mobile, Ipads and Widescreens). These are the two most important features which we feel are very important now a days in order to make better sales.
The core difference between the two is, Whitelableing solution is customizable to a certain extent whereas, the websites based on API is 100% customizable. You can build your own logics in order to take the business to next level. Like, Customized Reservation Email, Newsletters and reminders etc.
Such websites helps customers to find the best deals amongst various OTAs and shows the results in a single place. Once they find the deal they are navigated to the respective website and book the hotel/flights from there. This way, there is no registration or log of bookings maintained in the site.
Such websites has a feature of checkout which allows their customers to book the hotels remaining on the site. This way, it keeps cusomters are not routed to any other website. All the bookings takes place in your website and customers receives a customized email after reservation with your Private Branding. Customers can even register/login in order to view/cancel their booking history
Hotels Only (API Only). They have limited their API services to Hotels Only
Hotels + Flights (Whitelabeling and API Both) Their Whitelabeling is Free whereas they charge upto $1000-$1200/Year for their API usage
Hotels + Flights (Whitelabeling and API Both)
Booking.com Provides : Search Box Only
Every OTA offers different commission, for an example Travelpayouts shares upto 50 to 70% of the income they receive from agencies and airlines whereas Expedia affiliate will receive a 5% commission from the total booking amount, excluding the tax fees and any other fees imposed by the property, for their referral.