Shopify applies discount codes at checkout. Adding a notice to your cart reassures customers that their discount will be added on the next page
When it comes to the cart notice, there are three main options:
1. Choose not to display a cart notice
2. Display the cart notice as an in-text message
3. Display the cart notice as a fixed banner at the top or bottom of the cart page
To change the text of the discount notice, navigate to Settings >> Text labels
To choose what type of discount notice to display, navigate to Settings >> General and choose from the options for Cart notice mode. If you select fixed bar, you can choose from displaying at the top or bottom of the page.