Was just browsing Amazon gift card section while I was watching Extraordinary Attorney Woo and saw the details of this promo went live
Recommend to use the Amazon desktop version. You can see on the right, below the Order Total, of this screenshot says:
Qualifying offers:
GC promotion
This means that you have successfully applied the promo code for the first time. If it is giving you an error, it means that you may have entered the code previously
The first 2,000 customers of Amazon.com.au who enter the promotional code “CHRISTMASGC” in the “Gift Cards & Promotional Codes” box at checkout after purchasing $150 or more of Amazon.com.au Gift Cards in a single order will receive a $10 promotional credit that can be used on a future eligible order (“Offer”). You must use the $10 promotional credit by 11:59PM (AEST) on 30 June 2023. This Offer is available between 12:01AM (AEDT) on 13 December 2022 and 11:59PM (AEDT) on 14 December 2022. Your promotional credit will be automatically applied to your account used to make the purchase within two (2) business days after your order is shipped (for physical gift cards) or within two (2) business days after the order is completed (for electronic gift cards). You will receive an email that indicates the promotional code has been added to your account. Your promotional credit can only be used for purchases of eligible items shipped and sold by Amazon AU and will be automatically applied to your next purchase of eligible item(s) during checkout. See full terms and conditions below.
I just bought a $150 Amazon Gift card 15 minutes ago :/