[
  {"event_id":"evt-001","type":"order.created","order_id":"order-001","amount_cny":100},
  {"event_id":"evt-002","type":"order.created","order_id":"order-002","amount_cny":200},
  {"event_id":"evt-001","type":"order.created","order_id":"order-001","amount_cny":100},
  {"type":"order.created","order_id":"order-003","amount_cny":300}
]