How to Add Link that Automatically Applies a Coupon Code to a Shopify Cart

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Hi, how are you doing guys? I’m here to find a solution about Klaviyo Coupon Code that applies on a template.

If that says specifically that is “Add Link that Automatically Applies a Coupon Code to a Shopify Cart.”

Previously, I was trying like this way.

EXAMPLE COUPON CODE: SAVE30

I add this on a text block in template like this: {% coupon_code ‘SAVE30’ %}

EXAMPLE PRODUCT LINK: https://www.trupawsco.com/products/tru-multivitamin-1

I add this link on a button in template like this: https://www.trupawsco.com/discount/{% coupon_code ‘SAVE30’ %} redirect=/products/tru-multivitamin-1

After that, I previewed the template on my email.

But the button shows errors like " 404 Bad Gateway". What did I do wrong here?