Just refresh your page once you created a new advert in gumtree, it should appear if you keep refreshing.
no mention about multiple uses of the code or if its for new or existing customers
Thank you for your interest in Domino's Pizza on Gumtree.
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Congratulations on unlocking your Domino’s 40% off* Pizzas voucher! You can redeem this offer by inserting your unique code on the order screen of the Domino’s Ordering App.
*Conditions Apply. Available exclusively via Domino’s Ordering App. Not valid for use in-store or via dominos.com.au. Offer only valid until 29/12/18. Discount applies to premium & traditional menu price pizzas. 10% Sunday surcharge applies. Excludes Value Range, New Yorker Range, Dessert Pizza, King Size Range & Oven Baked Sandwiches. Minimum delivery order of $22. Surcharges apply for Premium pizzas, Vegan Cheese, half ‘n’ half, additional toppings and indulgent crusts.. Offers not valid with any other voucher or offer. Selected stores only. App store is a trade mark of Apple inc. Google Play is a trademark of Google Inc.
But there's a 50% off voucher posted on Ozbargain every week.