Thanks, I have deleted your duplicate question :)
Currently there is no built in payment gateway for Clipper, so there is no way to charge customers for posting coupons at this time. If you decided to manually collect fees, you could of course restrict registrations and coupon posting ability on the site, and only set up an account for someone to post once you collected via a manual method outside of Clipper.
Other than this, it would involve some customization on your part to implement a payment gateway.