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KlaviyoSchemaBehavioral

Response schema changed for POST /api/flows (MessageHierarchySmsItem)

Affected surface
POST /api/flows
Affected field
MessageHierarchySmsItem

What changed

Response schema changed for POST /api/flows (MessageHierarchySmsItem) Affected surface: POST /api/flows. Root cause: schema `MessageHierarchySmsItem`. Detected at Mon, 17 Aug 2026 16:14:04 UTC UTC.

Diff

{
  "path": "POST /api/flows",
  "removed_fields": [
    "selected_image"
  ],
  "schema_path": "schema MessageHierarchySmsItem"
}

Likely impact

The contract still holds, but observable behavior shifted — defaults, response timing, or rate-limit shaping. Existing code keeps compiling and most calls keep working, but edge cases may differ. Worth a sanity check.

Diff your serializers against the new schema. The diff above shows what moved.

Catch changes like this on every API you depend on.

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