prebbleton20
Based on the T&C's it looks like you have to spend at least $20 after the discount so min spend is $40.
From the email:
"Wow, just like that Fush Prebbleton is almost a whole month old, and we’re so grateful that the community has welcomed us with open arms.
We’d love to send some of that aroha back your way so here’s a $20 voucher to take the pressure off leading into silly season! Come on in, say kia ora to the whānau and see what all the fuss is about down at Fush Prebbleton! Only available to the 31st December.
*T&C's - Minimum spend of $20 required. Only available at FUSH Prebbleton. Not to be used in conjunction with any other offer. "