Selling ancillary products and services via multiple channels is central to most airline strategies  An airline will look to up sell internal inventory (e.g. seat selection, change PNR) and partner inventory (hotel, car hire). These may be present as a dynamic package and the payment processed inline (part of one transaction) or after the booking as a separate transaction. Airlines need to be mindful of this and note the impact on fees if the merchant category is impacted. This process may also involve you processing payments for others.

Other payment related issues to watch in the context of payment processing for ancillary revenue are:

• The PNR data set - could include all details and needs to be available online in one location;
• Support issues around processing voids and refunds if you have processed the initial transaction - e.g. you've sold a customer a hotel and now they wish to cancel it.
• Ancillary revenue must be channel agnostic - e.g. selling bag fees online as well as in customer present situation;

For comments on the process of currency conversion see the section on currency management.