npm install stripe @stripe/stripe-js

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import Stripe from 'stripe';

// Cloudflare Workers
const stripe = new Stripe(c.env.STRIPE_SECRET_KEY);

// Node.js
const stripe = new Stripe(process.env.STRIPE_SECRET_KEY!);

app.post('/api/checkout', async (c) => {
  const { priceId, successUrl, cancelUrl } = await c.req.json();

  const session = await stripe.checkout.sessions.create({
    mode: 'payment',
    line_items: [{ price: priceId, quantity: 1 }],
    success_url: successUrl || `${new URL(c.req.url).origin}/success?session_id={CHECKOUT_SESSION_ID}`,
    cancel_url: cancelUrl || `${new URL(c.req.url).origin}/pricing`,
  });

  return c.json({ url: session.url });
});

async function handleCheckout(priceId: string) {
  const res = await fetch('/api/checkout', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ priceId }),
  });
  const { url } = await res.json();
  window.location.href = url;
}

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**Hardcode price IDs** in your code (they don't change):
```typescript
const PRICES = {
  pro_monthly: 'price_1234567890',
  pro_yearly: 'price_0987654321',
} as const;

const session = await stripe.checkout.sessions.create({
  mode: 'subscription',
  line_items: [{ price: PRICES.pro_monthly, quantity: 1 }],
  success_url: `${origin}/dashboard?session_id={CHECKOUT_SESSION_ID}`,
  cancel_url: `${origin}/pricing`,
  // Link to existing customer if known:
  customer: customerId, // or customer_email: 'user@example.com'
});

async function hasActiveSubscription(customerId: string): Promise<boolean> {
  const subs = await stripe.subscriptions.list({
    customer: customerId,
    status: 'active',
    limit: 1,
  });
  return subs.data.length > 0;
}

app.post('/api/webhooks/stripe', async (c) => {
  const body = await c.req.text();
  const sig = c.req.header('stripe-signature')!;

  let event: Stripe.Event;
  try {
    // Use constructEventAsync for Workers (no Node crypto)
    event = await stripe.webhooks.constructEventAsync(
      body,
      sig,
      c.env.STRIPE_WEBHOOK_SECRET
    );
  } catch (err) {
    console.error('Webhook signature verification failed:', err);
    return c.json({ error: 'Invalid signature' }, 400);
  }

  switch (event.type) {
    case 'checkout.session.completed': {
      const session = event.data.object as Stripe.Checkout.Session;
      // Fulfill the order — update database, send email, grant access
      await handleCheckoutComplete(session);
      break;
    }
    case 'customer.subscription.updated': {
      const sub = event.data.object as Stripe.Subscription;
      await handleSubscriptionChange(sub);
      break;
    }
    case 'customer.subscription.deleted': {
      const sub = event.data.object as Stripe.Subscription;
      await handleSubscriptionCancelled(sub);
      break;
    }
    case 'invoice.payment_failed': {
      const invoice = event.data.object as Stripe.Invoice;
      await handlePaymentFailed(invoice);
      break;
    }
  }

  return c.json({ received: true });
});

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app.post('/api/billing/portal', async (c) => {
  const { customerId } = await c.req.json();

  const session = await stripe.billingPortal.sessions.create({
    customer: customerId,
    return_url: `${new URL(c.req.url).origin}/dashboard`,
  });

  return c.json({ url: session.url });
});

// Server: fetch products and prices
app.get('/api/pricing', async (c) => {
  const prices = await stripe.prices.list({
    active: true,
    expand: ['data.product'],
    type: 'recurring',
  });

  return c.json(prices.data.map(price => ({
    id: price.id,
    name: (price.product as Stripe.Product).name,
    description: (price.product as Stripe.Product).description,
    amount: price.unit_amount,
    currency: price.currency,
    interval: price.recurring?.interval,
  })));
});

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// On first checkout, create or find customer:
const session = await stripe.checkout.sessions.create({
  customer_email: user.email,  // Creates new customer if none exists
  // OR
  customer: user.stripeCustomerId,  // Use existing
  metadata: { userId: user.id },  // Link back to your user
  // ...
});

// In webhook, save the customer ID:
case 'checkout.session.completed': {
  const session = event.data.object;
  await db.update(users)
    .set({ stripeCustomerId: session.customer as string })
    .where(eq(users.id, session.metadata.userId));
}

const session = await stripe.checkout.sessions.create({
  mode: 'subscription',
  line_items: [{ price: PRICES.pro_monthly, quantity: 1 }],
  subscription_data: {
    trial_period_days: 14,
  },
  // ...
});

// Set currency when creating prices
const price = await stripe.prices.create({
  product: 'prod_XXX',
  unit_amount: 2900,  // $29.00 in cents
  currency: 'aud',
  recurring: { interval: 'month' },
});