Coupon details for coupon emails are now stored in customer metafields

Updated October 22, 2026

To strengthen security, we changed where coupon details are stored for sending coupons by email with Shopify Flow and Shopify Messaging.

Before

When a coupon was issued, the coupon code, discount, expiry date and whether it was single-use were written to customer tags, and the "Custom Liquid" section in the Messaging email read those tags.

After

• Coupon details are now written to customer metafields reserved for this app. Nothing is written to customer tags.
• The Custom Liquid code you paste into the Messaging email has been replaced with new code that reads the metafields. The new code is on the app's Help page.
• The Shopify Flow workflow file you can download from the Help page no longer includes the "Remove customer tags" step, which is no longer needed.

*If you already set up the email with the previous code, replace it with the new code from the Help page. Messaging allows customer data in only one section per email, so delete the old "Custom Liquid" section and keep just one.

In addition, we made internal improvements to strengthen security.