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The Billing Web SDK is fully typed and ships with TypeScript type definitions out of the box. The SDK includes comprehensive type definitions for all functions, options, and objects. This helps you catch errors early and provides autocompletion in your code editor. 
import {
  configure,
  createCheckout,
  CheckoutInstance,
  PaymentResult,
  CheckoutConfig,
  PaymentMethod,
} from '@funnelfox/billing';

// Configure
configure({
  orgId: 'your-org-id',
});

// Create checkout with type safety
const checkout: CheckoutInstance = await createCheckout({
  priceId: 'price_123',
  customer: {
    externalId: 'user_456',
    email: '[email protected]',
    countryCode: 'US',
  },
  container: '#checkout',
  clientMetadata: {
    source: 'web',
    campaign: 'summer-sale',
  },
  paymentMethodOrder: [
    PaymentMethod.PAYPAL,
    PaymentMethod.PAYMENT_CARD,
    PaymentMethod.GOOGLE_PAY,
    PaymentMethod.APPLE_PAY,
  ],
});

// Type-safe event handlers
checkout.on('success', (result: PaymentResult) => {
  console.log('Order:', result.orderId);
  console.log('Status:', result.status);
  console.log('Transaction:', result.transactionId);
});