Can I use multiple promo or discount codes in a single checkout? November 10, 2020 01:19 Updated No. Only one promo or discount code is allowed per checkout. Related articles What if I didn’t enter or apply promo or discount code before placing an order? How do I apply promo or discount code? Can I redeem my F3 points when I shop at Topshop Online? Can promo or discount code expiry be extended?