{
  "payment_type": "supplier_milestone",
  "ledger_entry_type": "supplier_milestone_approve",
  "authorization": "Confirm milestone acceptance, inspection results, and the approved collectible amount before requesting 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 collection attempts per approved invoice and cap collection at its outstanding balance.",
  "settlement": "Verify Payment status on the server. Never post native settlement entries manually.",
  "domain_rules": {
    "Inspection failure": "Resolve acceptance before charging for a milestone that depends on inspection.",
    "Order revision": "Preserve the approved purchase-order version associated with each invoice and Payment.",
    "Multiple milestones": "Give each approved installment its own receivable, Payment, and stable operation key."
  }
}