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GET /orders/{orderId}/messages

Lists messages for an order. Required scope: orders:read 
curl "$ARCHIVE_ORDER_BASE_URL/orders/order_123/messages" \
  -H "Authorization: Bearer $ARCHIVE_ORDER_API_KEY"
Response: 
[
  {
    "id": "msg_123",
    "content": "I found the register and will upload the scan shortly.",
    "senderId": "client_123",
    "timestamp": "2026-06-18T12:00:00Z"
  }
]

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POST /orders/{orderId}/messages

Sends a message on an order. Required scope: orders:write Request body: 
{
  "content": "Could you confirm whether the archive holds the 1892 register?"
}
Response: 
{
  "id": "msg_123"
}