チェックアウトセッションの作成

npm install @waffo/pancake-ts

import { WaffoPancake } from "@waffo/pancake-ts";

const client = new WaffoPancake({
  merchantId: process.env.WAFFO_MERCHANT_ID!,
  privateKey: process.env.WAFFO_PRIVATE_KEY!,
});

const session = await client.checkout.createSession({
  productId: "prod_xxx",
  currency: "USD",
});

// ユーザーをチェックアウトページにリダイレクト
res.redirect(session.checkoutUrl);

{
  "data": {
    "sessionId": "cs_xxx",
    "checkoutUrl": "https://checkout.waffo.ai/your-store/checkout/cs_xxx",
    "expiresAt": "2024-01-22T12:00:00Z"
  }
}

// ✅ 推奨：サーバーサイドリダイレクト
export async function POST(req: NextRequest) {
  const session = await client.checkout.createSession({ ... });
  return NextResponse.redirect(session.checkoutUrl);
}

// ✅ これも可：クライアントサイドリダイレクト
const { checkoutUrl } = await res.json();
window.location.href = checkoutUrl;

// ❌ 避けるべき：window.open — Safariとモバイルブラウザにブロックされる
window.open(checkoutUrl, "_blank"); // ブロックされます！

const session = await client.checkout.createSession({
  productId: "prod_xxx",
  currency: "USD",
  buyerEmail: "user@example.com",
});

const session = await client.checkout.createSession({
  productId: "prod_xxx",
  currency: "CNY",
  language: "zh-Hans",
  includePaymentMethods: ["wechat"],
  buyerEmail: user.email,
  successUrl: "https://yoursite.com/success?session_id={SESSION_ID}",
});

const session = await client.checkout.createSession({
  productId: "prod_xxx",
  currency: "JPY",
  language: "ja-JP",
  buyerEmail: user.email,
});

const MARKETS = {
  CN: { currency: "CNY", language: "zh-Hans", includePaymentMethods: ["wechat"] },
  JP: { currency: "JPY", language: "ja-JP" },
  DEFAULT: { currency: "USD" },
} as const;

const market = MARKETS[user.country as keyof typeof MARKETS] ?? MARKETS.DEFAULT;

const session = await client.checkout.createSession({
  productId: "prod_xxx",
  ...market,
  buyerEmail: user.email,
});

const session = await client.checkout.createSession({
  productId: "prod_xxx",
  currency: "USD",
  metadata: {
    user_id: "usr_abc123",
    campaign: "black_friday_2024",
    referrer: "twitter",
  },
  successUrl: "https://yoursite.com/success",
});

const session = await client.checkout.createSession({
  productId: "prod_subscription",
  currency: "USD",
  withTrial: true,
  successUrl: "https://yoursite.com/welcome",
});

const session = await client.checkout.createSession({
  productId: "prod_xxx",
  currency: "USD",
  billingDetail: {
    country: "US",
    isBusiness: false,
    state: "CA",
    postcode: "94105",
  },
});

const session = await client.checkout.createSession({
  productId: "prod_xxx",
  currency: "USD",
  successUrl: "https://yoursite.com/success?session_id={SESSION_ID}",
});

// app/api/upgrade/route.ts (Next.js App Router)
import { NextRequest, NextResponse } from "next/server";
import { WaffoPancake } from "@waffo/pancake-ts";

const client = new WaffoPancake({
  merchantId: process.env.WAFFO_MERCHANT_ID!,
  privateKey: process.env.WAFFO_PRIVATE_KEY!,
});

export async function POST(req: NextRequest) {
  const { userId, planId, email } = await req.json();

  const session = await client.checkout.createSession({
    productId: planId,
    currency: "USD",
    buyerEmail: email,
    metadata: { user_id: userId, action: "upgrade" },
    successUrl: `${process.env.NEXT_PUBLIC_APP_URL}/dashboard?upgraded=true`,
  });

  // サーバーサイドリダイレクト — すべてのブラウザで動作
  return NextResponse.redirect(session.checkoutUrl);
}

async function handleUpgrade(planId: string) {
  const res = await fetch("/api/upgrade", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ userId: currentUser.id, planId, email: currentUser.email }),
  });
  const { checkoutUrl } = await res.json();

  // 同じタブでリダイレクト — Safariでも安全
  window.location.href = checkoutUrl;
}