Dunkin' Donuts via Groupon: First Qualifying Transaction: Up to $3 Back Free, 10% thereafter (Valid In-Store Purchase Only)
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https://www.groupon.com/deals/dunkin-donuts-grouponplus-2?utm_campaign=1
The Deal
How to use this deal:Claim this deal by linking it to your eligible credit cards
Pay for qualifying purchases at the merchant with a linked card
Swipe your linked card at Dunkin’ Donuts to earn 100% cash back on your first purchase (up to $3)
Earn 10% cash back (up to $3) on every additional visit through April 19, 2018
Cash back rewards will be credited to your credit card statement within a few days