Resolved after 19 hours 5 minutes, on February 24, 2026.
Description On February 24th at 3:11 PM EST, a code change was deployed as part of a security improvement. The following morning at 8:35 AM EST, merchants began experiencing Shopify Checkout Extensions not rendering. Core checkout functionality remained operational and no data was lost or corrupted. Root Cause: The deployed change introduced a data shape update that was not reflected in the Checkout Extension schema, causing validation to fail during extension initialization and preventing extensions from rendering. Resolution: Our engineering team identified the mismatch and deployed a fix at 10:05 AM EST on February 25th, restoring full Checkout Extension functionality. Next Steps: Review and improve existing monitoring coverage for extension initialization failures to ensure alerts fire as expected. Additionally, introduce cross-functional review requirements for changes that touch shared data contracts to catch downstream impacts before deployment.
Update timeline
- resolved Mar 04, 2026, 06:49 PM UTC
Description On February 24th at 3:11 PM EST, a code change was deployed as part of a security improvement. The following morning at 8:35 AM EST, merchants began experiencing Shopify Checkout Extensions not rendering. Core checkout functionality remained operational and no data was lost or corrupted. Root Cause: The deployed change introduced a data shape update that was not reflected in the Checkout Extension schema, causing validation to fail during extension initialization and preventing extensions from rendering. Resolution: Our engineering team identified the mismatch and deployed a fix at 10:05 AM EST on February 25th, restoring full Checkout Extension functionality. Next Steps: Review and improve existing monitoring coverage for extension initialization failures to ensure alerts fire as expected. Additionally, introduce cross-functional review requirements for changes that touch shared data contracts to catch downstream impacts before deployment.
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