Which types of transactions can the Members use the discount coupons for?

Coupons can be used for store and PPV purchases . They cannot be used for membership subscriptions or token packages.

How can users apply the coupon?

On the product or PPV checkout pages, users will be able to add a valid coupon code which will apply the discount before checking out.

How will users come to know of the site discounts? Are eligible discount coupons shown in the checkout page?

No, the checkout page does not show the applicable discount codes. You can instead advertise discounts (and the associated codes) using site banners. To know more about site banners and how to use them, please check the Advertising Banners section of the knowledge base.