Can I offer my regular customers reward points or a loyalty discount on my portal?

Yes, in most cases you can reward repeat customers, though how you do it depends on what your plan includes. The simplest method, and the one that works everywhere, is a discount code you create yourself and hand to the customers you want to reward. You decide who gets it, how long it lasts and what it applies to, and it comes off the total at the payment stage like any other code.

A proper points scheme, where every booking earns something the customer can spend later, is a bigger piece of work. It needs the portal to keep a running balance against each customer record and to let that balance be redeemed at checkout, so it is not something every setup has switched on by default. Ask your provider whether points are part of your plan before you advertise a scheme to your customers, because rebuilding a promise after the fact is awkward.

One thing to keep in mind is where the money comes from. A discount or a redeemed point reduces your own margin, not the airline or hotel rate, since the supplier still charges you the same amount. So set the reward against the markup you earn rather than against the fare itself, and check that a generous code cannot push a booking below what you actually pay.

The practical next step is to start with codes for your best customers, watch how much they cost you over a few months, and only then ask about a full points scheme once you know what you can afford to give away.