#frankfs - promo code entry by customer
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Hi
Not in the hosted invoice page. You can apply the coupon on the backend side when creating or updating the invoice. This can be done by your integration not by the customer
https://stripe.com/docs/api/invoices/update#update_invoice-discounts-coupon
Customer-entry of discount codes (promotion codes, specifically) is only supported on Checkout, in terms of pre-built flows.
frankfs - promo code entry by customer