At Cotton On
Birthday voucher, reported as $10 off. Cotton On's own Perks pages (FAQ, welcome, T&Cs) confirm members receive a "Birthday surprise" if their date of birth is on file, but the official pages do NOT state a dollar value; the $10 figure is only confirmed via aggregators (birthdays.lari.com.au, OzBargain), which also say no minimum spend and that the $10 must be used in one transaction.
Conditions: Free Cotton On & Co. Perks membership; date of birth must be provided (sign up well before your birthday — voucher is emailed); per aggregators: no minimum spend, whole $10 in one transaction, redeemable across Cotton On & Co brands.
Perkroo lists the perks the memberships you already hold include — sorted by what’s nearest to you.
Perkroo is an independent Australian app. Cotton On are named for identification only — Perkroo is not affiliated with, endorsed by, or partnered with them. Offers change at the provider’s discretion; check the linked page before relying on one.