Promos are exclusively for subscription products, while coupons are for purchase/rental products only. We don't currently support a universal coupon code that works for all products.
Promos allow you to offer a time-limited discount that will attract new customers. You can use promos for special screening events, weekend flash sales, give them to niche groups, or hand out to friends.
Coupons let you offer discounts on transactional products and track how they're being used by your audience. You can create codes for promotional partners, festivals, events, weekend specials, and more.