신용카드 및 직불카드

const session = await client.checkoutSessions.create({
  product_cart: [{ product_id: 'prod_123', quantity: 1 }],
  allowed_payment_method_types: ['credit', 'debit'],
  return_url: 'https://example.com/success'
});

const session = await client.checkoutSessions.create({
  product_cart: [{ product_id: 'prod_123', quantity: 1 }],
  force_3ds: true,
  return_url: 'https://example.com/success'
});

const session = await client.checkoutSessions.create({
  product_cart: [{ product_id: 'prod_123', quantity: 1 }],
  show_saved_payment_methods: true,
  customer: { customer_id: 'cus_existing_123' },
  return_url: 'https://example.com/success'
});

// Get customer's saved payment methods
const methods = await client.customers.retrievePaymentMethods('cus_123');

// Use saved card for instant checkout
const session = await client.checkoutSessions.create({
  product_cart: [{ product_id: 'prod_123', quantity: 1 }],
  customer: { customer_id: 'cus_123' },
  payment_method_id: methods.items[0].payment_method_id,
  confirm: true,
  return_url: 'https://example.com/success'
});