Reusing discount codes in campaign emails

Hi All, 

Just looking for a way to be more efficient with unique discount codes. 

Background: 

Shopify client, using unique codes generated in Klaviyo. 

We’re looking to do a series of emails; 

1. Sale launch (unique discount code created) 
2. Follow up messaging based on whether or not a sale is completed 

Ideally i’d like to re-use the same discount code, I can see the active coupon on the customer profile but i’m not sure on how we can reference this in the template? 

Any thoughts?

Best wishes,
Phill