Sorry to see you have been awaiting a reply to your post, it appears it has just been moved into the pre-sales forum now. In answer to your questions:
1. By default, users can either print coupons, or use an online coupon code. You can also find a
QR code plugin in the AppThemes marketplace if this was something you are looking for.
2. You can find live sites on the
AppThemes customer showcase here.
3. We don't have recommended programs as such, although members of the community have discussed this in other threads if you wish to search the forums. You can find feed plugins in the
AppThemes marketplace for Clipper also.
4. You can use more than one of these plugins if you wish. Thanks.