You may use up to two TripGift eGift card codes within one booking/transaction as of the 7th July 2019.
All you need to do is search for the item you wish to book, add it to your basket and copy and paste each Gift card code (one by one) into the basket, each time you add a Gift card code you will need to click accept and confirm the full amount for each Gift card before adding the next Gift card.
If the value of your basket exceeds the amount you have available to spend on the Gift card codes you can pay the difference by using your Visa, Mastercard, AmEx, Discover Card & Diners Club.
To help you book:
Hotel + Car Rental
Hotel + Experience + eProducts