Promo codes and sales tax
Where to enter a promo code, and how tax shows up.
Promo codes
If you have a code, enter it on the Stripe payment page, in the Add promotion code box under your order. The discount shows before you pay. Codes can’t be added after an order is paid.
Sales tax
If sales tax applies to your order, it’s shown on the payment page before you pay and listed on your receipt. Questions about tax on a specific order? Email hello@stusyn.com.
Updated October 18, 2026