{
  "operationId": "createPaymentSession",
  "method": "POST",
  "path": "/agent/checkout-session",
  "examples": [
    {
      "name": "fromQuote",
      "summary": "Reuse a quote_id (no second carrier call)",
      "value": {
        "quote_id": "q_8f3c2e1a4b7d",
        "service": "USPS Ground Advantage"
      }
    },
    {
      "name": "fromShipment",
      "summary": "Price live and open checkout in one call",
      "value": {
        "product": "Yamaha FG800 acoustic guitar in a hard case",
        "from_zip": "07102",
        "to_zip": "30303",
        "to_country": "US",
        "quantity": 1
      }
    }
  ]
}