const Facturapi = require('facturapi');
const facturapi = new Facturapi('YOUR_API_KEY', {
  apiVersion: 'v2' // Optional, say what API version you want to use. Defaults to the latest version.
});

facturapi.customers.create({
  legal_name: 'Walter White',     // Razón social
  tax_id: 'WIWA761018',           // RFC
  email: '[email protected]', // Optional but useful to send invoice by email
  address: {
    street: 'Av. de los Rosales',
    exterior: '123',
    neighborhood: 'Tepito',
    zip: '06800',
    // city, municipality and state are filled automatically from the zip code
    // but if you want to, you can override their values
    // city: 'México',
    // municipality: 'Cuauhtémoc',
    // state: 'Ciudad de México'
  }
}).then(customer => {
  // Remember to store the customer.id in your records.
  // You will need it to create an invoice for this customer.
}).catch(err => console.log(err)); // Handle the error.

facturapi.products.create({
  product_key: '4319150114',  // Clave Producto/Servicio from SAT's catalog. Log in to FacturAPI and use our tool to look it up.
  description: 'Apple iPhone 8',
  price: 20000, // price in MXN.
  // By default, taxes are calculated from the price with IVA 16%
  // But again, you can override that by explicitly providing a taxes array
  // taxes: [
  //   { type: Facturapi.TaxType.IVA, rate: 0.16 },
  //   { type: Facturapi.TaxType.ISR, rate: 0.03666, withholding: true }
  // ]
}).then(product => {
  // Remember to store the product.id in your records.
  // You will need it to create an invoice for this product.
}).catch(err => console.log(err)); // Handle the error.

facturapi.invoices.create({
  customer: 'YOUR_CUSTOMER_ID',
  payment_form: Facturapi.PaymentForm.TRANSFERENCIA_ELECTRONICA, // Constant from SAT's catalog. Check out our documentation to learn more.
  items: [{
    quantity: 1, // Optional. Defaults to 1.
    product: 'YOUR_PRODUCT_ID' // You can also pass a product object instead
  }] // Add as many products as you want to include in your invoice
}).then(invoice => { ... });

// Once you have successfully created your invoice, you can...
const fs = require('fs');
facturapi.invoices.downloadZip(invoice.id) // or downloadPdf or downloadXml
  .then(zipStream => {
    // stream containing the PDF and XML as a ZIP file
    // Save your invoice to a folder
    const myZipFile = fs.createWriteStream('/path/to/destination/folder');
    zipStream.pipe(myZipFile);
    myZipFile.on('finish', () => {
      // Finished downloading, Yay!
    });

// Send the invoice to your customer's email (if any)
facturapi.invoices.sendByEmail(invioce.id) // Also returns a Promise
  .then(() => {
    // Successfully sent
  }).catch(err => console.log(err)); // Handle the error.