swipestripe/swipestripe-coupon

569 Coupon support in SwipeStripe

sunnysideup/ecommerce_discount_coupon

Version dev-master 372 adds a discount coupon functionality to your Silverstripe e-commerce application

sunnysideup/ecommerce_discount_coupon_countries

Version dev-master 85 Allows you to add silverstripe e-commerce discount vouchers to certain countries