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Dunkin’ Donuts [dunkindonuts.com] is offering a free medium Refresher when you redeem a promo code in the Dunkin’ app.

How to redeem:Open the Dunkin’ app
Go to the Offers tab
Scroll down and enter code: HIBARBIEHIDUNKIN
Redeem your reward for a free medium Refresher
Expires: June 11
YMMV. Must redeem through the app.