$5 Promo Credit with Purchase of $100 Amazon Gift Card ($90 with Zip Pay Offer)

Edit: Confirmed in comments that it works with Zip pay 10% back offer until they fix it tomorrow morning (shouldnt work with digital goods)

The first 4,000 customers who enter the promotional code ‘GIFTCARD5’ in the ‘redeem a Gift Card or Promotional Code” box at checkout when you purchase at least $100 in Amazon.com.au Gift Cards in a single transaction will receive a $5 promotional credit that can be used on a future eligible order. Your promotional credit will be automatically applied to your account within 4 business days after your order is shipped (for physical gift cards) or the order being completed (for electronic gift cards). A confirmation email will be sent confirming that the promotional code has been applied to your account. Your promotional credit can only be used for purchases of eligible items shipped and sold by Amazon AU and will be applied during checkout. One promotional credit per account and promotional credit will expire on January 17th 2021. Offer available until November 29th 2020 and valid while stocks last. See full terms and conditions below

Your promotional credit will be automatically applied to your account within 4 business days after your order is shipped (for physical gift cards) or the order being completed (for electronic gift cards)
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Terms & Conditions
In order to qualify for the promotional credit, you must: (1) be one of the first 4,000 customers to purchase at least $100 in eligible Amazon.com.au Gift Cards in a single order at Amazon.com.au between 12:01am (AEDT) on November 27th 2020 and 11:59 PM (AEDT) on November 29th 2020 (“Promotional Period”); and (2) enter the promotional code "GIFTCARD5" in the "redeem a Gift Card or Promotional Code" box at check out (“Qualifying Purchase”). Amazon.com.au Gift Card purchases must total at least $100 in combined value, and the Amazon.com.au Gift Card(s) must be purchased in a single order at Amazon.com.au during the Promotional Period. Amazon.com.au Gift Cards are subject to the Amazon.com.au Gift Card Terms and Conditions. Taxes, shipping and handling, and gift wrap charges, if applicable, do not apply when determining the minimum purchase amount. For Qualifying Purchases, a promotional credit of $5 will be automatically applied to the Amazon.com.au account that was used to purchase the Amazon.com.au Gift Card(s) within 4 business days after your order is shipped (for physical gift cards) or the order being completed (for electronic gift cards). An email notification will also be sent to the primary email address associated with the Amazon.com.au account used to purchase the Amazon.com.au Gift Card(s) within four (4) business days of the qualifying purchase being shipped to confirm that the promotional code has been applied to the relevant account. Limit one promotional credit per Amazon.com.au account. This promotional credit entitles any customer to $5 off their future purchase of “eligible items” shipped and sold by Amazon AU. “Eligible items” excludes products sold by third party sellers including Amazon US (Amazon Global Store) even if “fulfilled by Amazon”, digital purchases such as e-books, products that are not in new condition such as renewed products, subscriptions such as Prime Video and Audible, gift cards and postage or delivery rates. Amazon AU’s standard delivery rates and policies apply to any purchase made pursuant to the offer. The promotional credit can only be redeemed once per customer on eligible items and cannot be used in conjunction with any other offer. If Amazon considers a customer to be operating multiple accounts, those accounts will, for the purposes of this offer, be treated as one customer. If you return any item purchased using the promotional credit, Amazon AU will only refund the price actually paid for the item (that is, less the value of the promotional credit) and the promotional credit will be invalidated. The promotional credit is not transferable and may not be resold, redeemed for or applied toward the purchase of any gift cards sold at Amazon.com.au. The maximum benefit you may receive from this offer is $5.00. Offer ends at 11:59 PM (AEDT) on November 29th 2020 and is valid while stocks last. The promotional credit expires at 11:59 PM (AEDT) on January 17th 2021.