Hi there again @pile, 

Happy to see you’re learning by asking questions on the Community! Happy to help! 

You can definitely accomplish this! While users can send their new subscribers a coupon in their welcome flow email , you could also show the coupon code in the success message of a form itself right on your website! 

Hope this helps! 

-Taylor 

So I am wondering if we can retrieve the assigned code per user without using a form. 

The idea is that it could be displayed within a banner on the site that is displayed by Shopify i.e at the top of the header. 

From what I can see there is no option to place content via Klaviyo i.e a banner, only as a form. 
See example below: 
 

Hi there @pile, 

To confirm, you are correct, this isn’t a native option to display the code again to each specific user on your website in Klaviyo. 

You would need to contact your developer or a Klaviyo partner  to create this custom workflow for you. If you are not interested in a custom solution I would take the steps I mention above! 

Hope this helps! 

-Taylor