When making a purchase on a merchant's site, can I use additional coupon/promotional codes that I find elsewhere? No! Only coupon/promotional codes found on Hoopla may be used on our merchant's sites at checkout, as these are provided to us by the merchant. Use of other coupon/promotional codes NOT found on Hoopla WILL NOT guarantee cash back on your transaction. Merchant's do not credit us for the use of them, therefore, we can not credit you.