Deliver mission-critical invoices with guaranteed deliverability & attachments

import { SadaSend } from 'sadasend';
import * as fs from 'node:fs';

const sadasend = new SadaSend(process.env.SADASEND_API_KEY!);

export async function sendMonthlyInvoice(customerEmail: string, invoiceId: string, pdfBuffer: Buffer) {
  return await sadasend.emails.send({
    from: 'billing@yourdomain.com',
    to: customerEmail,
    subject: `Invoice #${invoiceId} from Acme Corp`,
    html: `<p>Please find attached your invoice <strong>#${invoiceId}</strong>.</p>`,
    attachments: [
      {
        filename: `invoice-${invoiceId}.pdf`,
        content: pdfBuffer.toString('base64'),
        contentType: 'application/pdf'
      }
    ],
    tags: ['billing', 'invoice-pdf']
  });
}