Apply Discount Code to Checkout Automatically
The discount will then be automatically applied.
Note: This feature does not work if the discount code is configured to only apply Once Per Customer, since that would match by email. If the discount is automatically applied, there is no email and this does not apply. If you must have One Per Customer enabled, then the best solution to fit your needs would require a totally custom built system that applies discounts to orders post purchase. This would require access to our API, which we're working to make possible. Right now, integrating with our API is in beta, but if you're interested in learning more we can send you documentation.