チェックアウト API リファレンス

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15async function handleCheckout(sessionJson: string) {
  const session = JSON.parse(sessionJson);

  if (!window.openai?.requestCheckout) {
    throw new Error("requestCheckout is not available in this host");
  }

  // Host opens the ChatGPT payment sheet.
  const order = await window.openai.requestCheckout({
    ...session,
    id: String(session.id), // Use a unique ID for every checkout session.
  });

  return order; // Host returns the order payload.
}

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33import { useState } from "react";

function CheckoutButton({
  checkoutSessionJson,
}: {
  checkoutSessionJson: string;
}) {
  const [isLoading, setIsLoading] = useState(false);
  const [order, setOrder] = useState<Record<string, unknown> | null>(null);
  const checkoutButton = (
    <button
      onClick={async () => {
        setIsLoading(true);
        try {
          const orderResponse = await handleCheckout(checkoutSessionJson);
          setOrder(orderResponse);
        } catch (error) {
          console.error(error);
        } finally {
          setIsLoading(false);
        }
      }}
    >
      {isLoading ? "Loading..." : "Checkout"}
    </button>
  );
  return (
    <>
      {checkoutButton}
      <pre>{JSON.stringify(order, null, 2)}</pre>
    </>
  );
}

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115const checkoutRequest = {
  id: "checkout_session_123",
  payment_provider: {
    provider: "stripe",
    merchant_id: "merchant_123",
    supported_payment_methods: [
      {
        type: "card",
        allowed_card_brands: ["visa", "mastercard"],
      },
      { type: "apple_pay" },
      { type: "google_pay" },
    ],
    managed_payment_methods: [
      {
        type: "card",
        id: "pm_123",
        display_name: "Visa ending in 4242",
        display_last4: "4242",
        display_brand: "visa",
      },
    ],
  },
  payment_mode: "live",
  status: "ready_for_payment",
  currency: "USD",
  metadata: {
    cart_id: "cart_123",
    merchant_order_reference: "order_ref_123",
  },
  line_items: [
    {
      id: "line_item_123",
      item: {
        id: "item_123",
        quantity: 1,
      },
      name: "Canvas backpack",
      description: "A weather-resistant everyday backpack.",
      images: ["https://merchant.example.com/images/canvas-backpack.png"],
      base_amount: 3000,
      discount: 0,
      subtotal: 3000,
      tax: 300,
      total: 3300,
    },
  ],
  totals: [
    {
      type: "items_base_amount",
      display_text: "Items subtotal",
      amount: 3000,
    },
    {
      type: "subtotal",
      display_text: "Subtotal",
      amount: 3000,
    },
    {
      type: "fulfillment",
      display_text: "Shipping",
      amount: 550,
    },
    {
      type: "tax",
      display_text: "Tax",
      amount: 300,
    },
    {
      type: "total",
      display_text: "Total",
      amount: 3850,
    },
  ],
  fulfillment_options: [
    {
      id: "standard_shipping",
      type: "shipping",
      title: "Standard shipping",
      subtitle: "Arrives in 3-5 business days",
      carrier: "USPS",
      earliest_delivery_time: "2027-01-15T15:00:00Z",
      latest_delivery_time: "2027-01-19T18:00:00Z",
      subtotal: 500,
      tax: 50,
      total: 550,
    },
  ],
  fulfillment_option_id: "standard_shipping",
  fulfillment_address: {
    name: "Jane Customer",
    line_one: "123 Main St",
    line_two: "Apt 4B",
    city: "San Francisco",
    state: "CA",
    country: "US",
    postal_code: "94107",
    phone_number: "+14155550123",
  },
  messages: [
    {
      type: "info",
      param: "fulfillment_address",
      content_type: "plain",
      content: "Free returns within 30 days.",
    },
  ],
  links: [
    { type: "terms_of_use", url: "https://merchant.example.com/terms" },
    { type: "privacy_policy", url: "https://merchant.example.com/privacy" },
    { type: "support_url", url: "https://merchant.example.com/support" },
  ],
};

const response = await window.openai.requestCheckout(checkoutRequest);

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118from typing import Any, Literal

from fastmcp import FastMCP
from fastmcp.tools.tool import ToolResult
from pydantic import BaseModel

server = FastMCP("Checkout response fixture")
META_SESSION_ID = "openai/checkoutSessionId"


class Buyer(BaseModel):
    email: str


class PaymentData(BaseModel):
    # Deliberately accepts only a local fixture token, never real payment credentials.
    token: Literal["example-payment-token"]


class CompleteCheckoutOutput(BaseModel):
    id: str
    status: str
    currency: str
    line_items: list[dict[str, Any]]
    fulfillment_address: dict[str, Any]
    fulfillment_options: list[dict[str, Any]]
    fulfillment_option_id: str
    totals: list[dict[str, Any]]
    order: dict[str, Any]


@server.tool(
    description="Return the local checkout response fixture; does not charge a payment method or create a real order.",
    output_schema=CompleteCheckoutOutput.model_json_schema(),
)
async def complete_checkout(
    checkout_session_id: str,
    buyer: Buyer,
    payment_data: PaymentData,
) -> ToolResult:
    if checkout_session_id != "example-session":
        raise ValueError("This response fixture only accepts example-session")
    return ToolResult(
        content=[],
        structured_content={
            "id": checkout_session_id,
            "status": "completed",
            "currency": "USD",
            "line_items": [
                {
                    "id": "line_item_1",
                    "item": {
                        "id": "item_1",
                        "quantity": 1,
                    },
                    "base_amount": 3000,
                    "discount": 0,
                    "subtotal": 3000,
                    "tax": 300,
                    "total": 3300,
                },
            ],
            "fulfillment_address": {
                "name": "Jane Customer",
                "line_one": "123 Main St",
                "line_two": "Apt 4B",
                "city": "San Francisco",
                "state": "CA",
                "country": "US",
                "postal_code": "94107",
                "phone_number": "+1 (555) 555-5555",
            },
            "fulfillment_options": [
                {
                    "id": "fulfillment_option_1",
                    "type": "shipping",
                    "title": "Standard shipping",
                    "subtitle": "3-5 business days",
                    "carrier": "USPS",
                    "earliest_delivery_time": "2026-02-24T15:00:00Z",
                    "latest_delivery_time": "2026-02-28T18:00:00Z",
                    "subtotal": 0,
                    "tax": 0,
                    "total": 0,
                },
            ],
            "fulfillment_option_id": "fulfillment_option_1",
            "totals": [
                {
                    "type": "items_base_amount",
                    "display_text": "Items subtotal",
                    "amount": 3000,
                },
                {
                    "type": "subtotal",
                    "display_text": "Subtotal",
                    "amount": 3000,
                },
                {
                    "type": "tax",
                    "display_text": "Tax",
                    "amount": 300,
                },
                {
                    "type": "total",
                    "display_text": "Total",
                    "amount": 3300,
                },
            ],
            "order": {
                "id": "order_id_123",
                "checkout_session_id": checkout_session_id,
                "permalink_url": "",
            },
        },
        meta={META_SESSION_ID: "checkout-flow"},
        is_error=False,
    )