Configure The Email Capture Smart Bar
A bar that gives a coupon code to customers if they type their email address. Ensure you configure the coupon code in the Discounts section and then customize the message displayed before the customers enter their emails and the message displayed after.
You can find a detailed guide from Shopify on how discount codes can be created here: Creating discount codes.
If you already use our Product Bundles and Volume Discounts apps, the provided discount code will overwrite the automatically generated one if used by the customer. This happens because Shopify allows only one discount code per order. You can read more about this here.