{
  "payment_type": "tour_deposit",
  "ledger_entry_type": "tour_deposit_apply",
  "authorization": "Confirm the traveler, itinerary, accepted price, and deposit amount before creating the booking's Payment.",
  "amounts": "Positive integer strings in USD cents, resolved server-side from approved records.",
  "identity": "Authenticate the payer and resolve the Ledger and business record server-side.",
  "idempotency": "Persist one stable key and exact payload per operation. Recover existing operations after timeouts.",
  "concurrency": "Serialize application approvals per record; the apply entry condition prevents a negative available balance.",
  "settlement": "Verify Payment status on the server. Never post native settlement entries manually.",
  "domain_rules": {
    "Itinerary change": "Approve the revised booking before collecting any additional deposit.",
    "Group booking": "Keep payer authorization and each booking's allocation in the reservation system.",
    "Travel disruption": "Use the operator's approved service decision before applying prepaid funds to a changed tour."
  }
}