{
  "_comment": "Assumed-shape fixture — verify against real Pancake payload in Phase 3",
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    "conversation": {
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      "type": "INBOX",
      "from": {"id": "109139680425439630", "name": "Test Buyer"}
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    "message": {
      "id": "spo_msg_1",
      "content": "Shop oi con hang khong?",
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