Couponis is one of a kind theme which is designed to serve coupons either submitted by your users or imported via XML/CSV file from the affiliate network or both. Theme is designed to be super fast and not to add any stress to WP queries while providing best features at the same time. With the help of WP All Import plugin ( free version is enough ) you are able to import any coupons via XML/CSV file provided by your affiliate network.
info: https://themeforest.net/item/couponis-affiliate-submitting-coupons-wordpress-theme/20506148