New fields added in POST /v4/subscribers response 201: [warnings]

What changed

New fields added in POST /v4/subscribers response 201: [warnings] Affected surface: POST /v4/subscribers. Root cause: endpoint `POST /v4/subscribers`. Detected at Tue, 09 Jun 2026 02:24:23 UTC UTC.

Diff

{
  "added_fields": [
    "warnings"
  ],
  "path": "POST /v4/subscribers",
  "schema_path": "POST /v4/subscribers response 201"
}

Likely impact

This is an additive change. Existing integrations are unaffected; this is mostly useful if you want to take advantage of the new surface.

Recommended action

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