From your Shopify admin, go to Products > Gift Cards. Click the code for the issued gift card. You'll be able to see only the last four characters of the code. On the issued gift card's page, you can view its details and Edit.

hope this is going to he

Thanks @Global_sale1 . I understand how to view and use Gift Cards in Shopify. But what I’m after is a way to add Gift Card data into a Klaviyo email/flow.

For example, if someone buys a gift card, I want to send them an email through Klaviyo with the code {{ gift_card.code }}, or at the very least a link to the code {{ gift_card.url }}

Hi there @TheSuburbs,

If the gift card codes are already created, you could upload them into Klaviyo as custom properties for each profile and use the 'person | lookup' tag to pull in the value for that property in your email: Template Tags and Variable Syntax

However, I'm afraid at this time that Klaviyo does not have any native support specific to Shopify Gift Cards.
As a workaround, I was able to find that we do offer an existing template for sending a Gift Card Notification. You can see that when reviewing the Shopify Notification Templates here: 

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You can use that template as a starting point for how you want to email to look. You can then also replace any of the variables in the email if needed. You can then export the template HTML for use in Shopify.
 

Hope that helped,

Alex