Seems like the gift cards are limited to a max $300 value each (including custom denomination). You can purchase multiple $300 and still receive the 15% discount though.
Use at thousands of restaurants, bars, cafés & fast-food establishments that accept EFTPOS or Visa cards around Australia.
Terms and conditions now specify the card can be used at:
Caterers (5811);
Eating Places and Restaurants (5812);
Drinking Places (Alcoholic Beverages), Drinking Places (Non-Alcoholic Beverages), Bars, Taverns, Cocktail Lounges, Nightclubs and Discoteques (5813);
Fast Food Restaurants (5814);
Hotels, Motels & Resorts (7011);
Amusement Parks, Circuses, Carnivals and Fortune Tellers (7996); and
Membership Clubs (Sports, Recreation, Athletic), Country Clubs and Private Gold Courses (7997).
Full terms and conditions here
This offer is valid on The Restaurant Choice digital gift card purchases made at www.restaurantchoice.com.au/Buy, using the promotional code PERFECT15 at checkout. This offer is valid from 12/12/2022 00:00 AEDT until 18/12/2022 23:59 AEDT. Only one offer per transaction. This offer cannot be used in conjunction with any other promotion.
Beat me to it. Thanks for posting.