At Donut King
Free regular-size hot or cold beverage for your birthday.
Conditions: DK Rewards member, registered with date of birth provided at signup. Per official FAQ the reward is issued 7 days before your birthday and is valid for one month; the T&Cs (per search snippet) describe it as added on the first day of the birth month and expiring 11:59pm on the last day of that month — either way, roughly a birthday-month window, not on-the-day only.
Perkroo lists the perks the memberships you already hold include — sorted by what’s nearest to you.
Perkroo is an independent Australian app. Donut King 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.