Here is the page of Groupon US merchant
Groupon US
Up to 15 Miles per $10

Groupon US

When will I get my Miles?

PurchaseToday
Tracked within i5 day(s)
Awarded within i105 day(s)
No rewards are given on Charity/Promotional, Groupon Epic Deal purchases, iTunes Credit, gift card purchases or when using Groupon Bucks. No rewards given on Goods category purchases.

Please ensure when you submit Order Inquiries that you only utilize the Order ID from the MyGroupon page. This is a 9-10 digit numeric-only Order ID. You can locate it in the “My Stuff” menu in the upper right side of the Groupon website. Once there, the Order # will be indicated on each order.
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Rewards are not calculated on postage / handling / delivery costs or associated purchase taxes in your region (This may include but not be limited to VAT, GST etc).

About Groupon US

Groupon features a daily deal on the best stuff to do, see, eat, and buy in a variety of cities across the United States and has been recently featured on the Today Show, Good Morning America, and named the #1 Hottest Website for 2010 by Fox Business News!