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const session = await client.checkoutSessions.create({
  product_cart: [
    { product_id: 'prod_abc', quantity: 1 }
  ],
  discount_code: 'WELCOME20', // Pre-apply a code
  feature_flags: {
    allow_discount_code: true // Show discount input field
  },
  return_url: 'https://yoursite.com/return'
});

const session = await client.checkoutSessions.create({
  product_cart: [
    { product_id: 'prod_abc', quantity: 1 }
  ],
  custom_fields: [
    {
      key: 'company_name',
      label: 'Company Name',
      field_type: 'text',
      required: true
    },
    {
      key: 'team_size',
      label: 'Team Size',
      field_type: 'dropdown',
      required: true,
      options: ['1-10', '11-50', '51-200', '200+']
    }
  ],
  return_url: 'https://yoursite.com/return'
});

const session = await client.checkoutSessions.create({
  product_collection_id: 'pdc_abc123',
  product_cart: [], // Required: pass an empty array for collection checkout
  return_url: 'https://yoursite.com/return'
});

const session = await client.checkoutSessions.create({
  product_cart: [
    { product_id: 'prod_abc', quantity: 1 }
  ],
  customer: {
    email: 'customer@example.com',
    name: 'Jane Doe'
  },
  billing_currency: 'EUR', // Set specific currency
  discount_code: 'PROMO10',
  feature_flags: {
    allow_discount_code: true
  },
  return_url: 'https://yoursite.com/return',
  metadata: {
    order_ref: 'ORD-12345'
  }
});

const session = await client.checkoutSessions.create({
  product_cart: [
    { product_id: 'prod_abc', quantity: 1 }
  ],
  customization: {
    theme_config: {
      // Custom fonts
      font_primary_url: 'https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap',
      font_size: 'md',
      font_weight: 'medium',
      radius: '8px',
      pay_button_text: 'Complete Purchase',
      
      // Light mode colors
      light: {
        bg_primary: '#ffffff',
        bg_secondary: '#f5f5f5',
        text_primary: '#1a1a1a',
        text_secondary: '#666666',
        button_primary: '#0066ff',
        button_primary_hover: '#0052cc',
        button_text_primary: '#ffffff',
        border_primary: '#e0e0e0'
      },
      
      // Dark mode colors
      dark: {
        bg_primary: '#1a1a1a',
        bg_secondary: '#2d2d2d',
        text_primary: '#ffffff',
        text_secondary: '#a0a0a0',
        button_primary: '#3385ff',
        button_primary_hover: '#4d99ff',
        button_text_primary: '#ffffff',
        border_primary: '#404040'
      }
    }
  },
  return_url: 'https://yoursite.com/return'
});