How do I create a coupon?
Open Coupons → New coupon. Type a code or press Generate, choose a percentage (1–99) or a fixed amount, and choose whether it works on one funnel or all of them. Optionally set a start date, an end date and a maximum number of uses.
How do customers use a code?
At checkout they click Have a coupon code?, type the code and see the new total at once. They can remove it again. A link ending in ?coupon=SPRING20 applies the code by itself, even if the visitor passes through other pages of the funnel first.
What are the rules?
One coupon per order. A coupon takes money off the main product only, not upsells or bumps. A use is counted only when the payment succeeds, and a discount that would bring the total under 0.50 is refused because Stripe cannot charge less.