Append your code to your store url:
The url above shows you how you could link to your store with a discount code. Once enabled, the code will automatically be applied during checkout. The important part is to append ?discount=[YourDiscountCode] after your shop url.
By activating the option to show a bar up top that the code is active and will be applied during checkout you can keep the customers interest up and encourage sales.
You may even customize the bar to fit your shop's color patterns.
Unfortunately the app doesn't work for all stores in the current situation where some have custom-built carts that we don't support. If it doesn't work for you, please contact us and we will try to add support for your store.