How coupons, promos, and discount codes are applied?

1. The discount code field will not appear until you either create a coupon or a gift card.
2. If the promo code is for 100% off or the dollar value meet or exceeds the price of the service, they will not have to enter their credit card.
3. While setting up limit for any coupon/promo/discount code, once it is set, it can be used up to that number of time by any number of customers.
   (For instance) So a limit of 3 means the coupon can be used up to 3 times by any number of customers on first come first serve basis.