Can I add my own markup to the prices my customers see on my portal?

Yes, in most cases you can add your own markup to the prices your customers see, and they will only ever see the final figure, not the supplier's price sitting underneath it.

The usual way this works is that you set a markup rule in your admin area and the portal applies it automatically to every search result before the page is drawn. You can normally choose whether the markup is a percentage or a flat amount, and you can often set different rules for different products, so flights carry one rule and hotels carry another. Many setups also let you keep separate rules for the smaller agents who work under you, so each group of users sees prices that suit the way you deal with them.

There are limits worth knowing about, because not every part of a price can be marked up. Taxes and supplier collected fees usually have to be passed through exactly as they come, and with some airline fares the rules of the fare itself restrict what can be added on top, so your markup may apply only to the base part of the price. What is possible here also depends on the supplier and on the plan you are on, so it is fair to expect some differences between one source of content and another.

Before you go live, set your rules and then run a few real searches and take one booking all the way through to the confirmation page, so you can check that the amount your customer pays and the amount printed on the voucher are both what you expected.