You are welcome to enter and apply your Groupon coupon code in the discount code field during check-out. Please note, however, that the Groupon vouchers have staggered minimum order values and cannot be applied to mini sets, gift cards and sale items:
10 € voucher - minimum order value 29 €.
30 € voucher - minimum order value 59 €
50 € voucher - minimum order value 89 €
And be aware that these voucher codes have an individual expiring date.
You can also find more information at: https://www.groupon.de/deals/ava-may