Hi Swetha,
Distributing coupons to users is part of your overall marketing strategy and businesses do it different ways including the following:
- Email
- Snail Mail
- Posting on other sites
- Posting on your site secured by DNN role
- Phone
Im sure there are many other ways that businesses distribute coupons but that should give you some ideas. The cart doesnt provide a mechanism for distributing coupons to your users today since its typically handled by more traditional marketing channels.