await alguna.organization.updateInvoiceSettings({
  // Numbering
  invoicePrefix: 'INV-',
  invoiceNumberFormat: 'YYYY-NNNNN', // INV-2024-00001

  // Delivery
  defaultDeliveryMethod: 'email',
  attachPdf: true,
  ccFinanceTeam: true,
  ccEmails: ['accounting@yourcompany.com'],

  // Payment terms
  defaultPaymentTerms: 'net_30',
  lateFeePercentage: 1.5, // 1.5% monthly

  // Branding
  logoUrl: 'https://example.com/logo.png',
  accentColor: '#00BA61',
  footerText: 'Thank you for your business!',
});

await alguna.accounts.update('acc_xyz789', {
  invoiceSettings: {
    paymentTerms: 'net_45', // Custom terms for this customer
    deliveryMethod: 'email',
    recipients: ['billing@customer.com', 'finance@customer.com'],
    language: 'de', // German invoices
    currency: 'EUR',
  },
});

await alguna.accounts.update('acc_xyz789', {
  autoPayEnabled: true,
  defaultPaymentMethodId: 'pm_card_visa4242',
});

await alguna.accounts.update('acc_xyz789', {
  autoPayEnabled: true,
  autoPayTiming: 'days_before_due',
  autoPayDaysBefore: 3, // Charge 3 days before due
});

await alguna.organization.updateSettings({
  defaultAutoPayTiming: 'on_due_date',
});

await alguna.organization.updatePaymentSettings({
  acceptedMethods: ['card', 'ach', 'sepa', 'wire'],
  displayWireInstructions: true,
  wireInstructions: {
    bankName: 'First National Bank',
    accountNumber: '****1234',
    routingNumber: '021000021',
    reference: 'Invoice {{invoice_number}}',
  },
});

// Via hosted checkout
const session = await alguna.checkoutSessions.create({
  accountId: 'acc_xyz789',
  mode: 'setup', // Just save payment method
  successUrl: 'https://yourapp.com/success',
  cancelUrl: 'https://yourapp.com/cancel',
});

// Customer completes flow, payment method saved automatically

await alguna.organization.updateDunningSettings({
  enabled: true,
  schedule: [
    { daysPastDue: 0, action: 'retry_payment' },
    { daysPastDue: 3, action: 'email_reminder', template: 'gentle' },
    { daysPastDue: 3, action: 'retry_payment' },
    { daysPastDue: 7, action: 'email_reminder', template: 'firm' },
    { daysPastDue: 7, action: 'retry_payment' },
    { daysPastDue: 14, action: 'email_reminder', template: 'final' },
    { daysPastDue: 30, action: 'mark_uncollectible' },
  ],
});

await alguna.emailTemplates.update('dunning_gentle', {
  subject: 'Action needed: Payment for Invoice {{invoice_number}}',
  body: `
Hi {{customer_name}},

We were unable to process payment for invoice {{invoice_number}}.

Amount due: {{amount_due}}
Due date: {{due_date}}

Please update your payment method: {{update_payment_link}}

Thanks,
The {{company_name}} Team
  `,
});

await alguna.organization.updateReminderSettings({
  beforeDue: {
    enabled: true,
    daysBefore: [7, 3, 1], // Send 7, 3, and 1 day before
    template: 'upcoming_due',
  },
});

await alguna.organization.updateReminderSettings({
  afterDue: {
    enabled: true,
    daysAfter: [1, 7, 14], // Send 1, 7, and 14 days after
    templates: {
      1: 'past_due_gentle',
      7: 'past_due_firm',
      14: 'past_due_final',
    },
  },
});

await alguna.invoices.sendReminder('inv_abc123', {
  template: 'custom_reminder',
  message: 'Please prioritize this payment.',
  cc: ['sales@yourcompany.com'],
});

const portal = await alguna.accounts.createPortalSession('acc_xyz789', {
  returnUrl: 'https://yourapp.com/billing',
  flow: 'invoices', // Go directly to invoices
});

console.log('Portal URL:', portal.url);
// Redirect customer to portal.url

const invoices = await alguna.invoices.list({
  accountId: 'acc_xyz789',
  status: ['issued', 'paid'],
  limit: 20,
});

invoices.data.forEach(inv => {
  console.log(`${inv.invoiceNumber}: ${inv.status} - $${inv.total}`);
});

const invoice = await alguna.invoices.get('inv_abc123');

console.log('Invoice:', invoice.invoiceNumber);
console.log('Status:', invoice.status);
console.log('Total:', invoice.total);
console.log('Line items:', invoice.lineItems);
console.log('Payments:', invoice.payments);

const pdf = await alguna.invoices.getPdf('inv_abc123');
console.log('Download URL:', pdf.url);

await alguna.invoices.recordPayment('inv_abc123', {
  amount: '1500.00',
  paymentDate: '2024-01-20',
  method: 'wire_transfer',
  reference: 'Wire ref: 12345',
  notes: 'Payment received via wire',
});

app.post('/webhooks/alguna', (req, res) => {
  const event = req.body;

  switch (event.type) {
    case 'invoice.issued':
      console.log(`Invoice ${event.data.invoiceNumber} sent to customer`);
      break;

    case 'invoice.viewed':
      console.log(`Customer viewed invoice ${event.data.invoiceNumber}`);
      // Good signal for follow-up timing
      break;

    case 'invoice.paid':
      const { invoiceNumber, total, paidAt } = event.data;
      console.log(`Invoice ${invoiceNumber} paid: $${total}`);
      // Trigger fulfillment, update CRM, etc.
      break;

    case 'invoice.payment_failed':
      const { invoiceNumber: failedInv, failureReason } = event.data;
      console.log(`Payment failed for ${failedInv}: ${failureReason}`);
      // Alert sales team, update customer status
      break;

    case 'invoice.past_due':
      console.log(`Invoice ${event.data.invoiceNumber} is now past due`);
      // Escalate to collections, pause service, etc.
      break;
  }

  res.sendStatus(200);
});

await alguna.emailTemplates.update('invoice_issued', {
  subject: 'Invoice {{invoice_number}} from {{company_name}}',
  fromName: '{{company_name}} Billing',
  replyTo: 'billing@yourcompany.com',
  body: `...`, // HTML template
});