Build with the Trailing Paper API.

# 1. Create an invoice
curl -X POST "https://trailingpaper.com/api/invoices" \
  -H "Authorization: Bearer tp_live_..." \
  -H "Content-Type: application/json" \
  -d '{
    "customer_id": 42,
    "items": [{
      "name": "Q2 Retainer",
      "quantity": 1,
      "unit_price": 4250.00
    }],
    "send_email": true
  }'

// 1. Create an invoice (Node + fetch)
const res = await fetch(
  'https://trailingpaper.com/api/invoices',
  {
    method: 'POST',
    headers: {
      'Authorization': `Bearer ${process.env.TP_KEY}`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      customer_id: 42,
      items: [{ name: 'Q2 Retainer', quantity: 1, unit_price: 4250 }],
      send_email: true,
    }),
  }
);