{
  "payment_type": "maintenance_funding",
  "ledger_entry_type": "maintenance_funding_apply",
  "authorization": "Verify the owner, managed property, work order, and authorized funding amount before creating the 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": {
    "Owner approval limit": "Obtain additional approval when the work order exceeds the original funding authorization.",
    "Property separation": "Do not use another property's available funding to cover this work order.",
    "Bill matching": "Match the approved bill to the work order before allocating collected owner funds."
  }
}