Invoice PDF API

1. Save this as invoice.json

{
  "template": "invoice",
  "data": {
    "brand": {
      "name": "Northwind Studio",
      "color": "#0f766e",
      "email": "billing@northwind.example",
      "website": "northwind.example",
      "address": [
        "100 Market St",
        "Denver, CO 80202"
      ]
    },
    "number": "INV-1042",
    "issue_date": "2026-10-15",
    "due_date": "2026-11-14",
    "currency": "USD",
    "tax_rate": 8.31,
    "customer": {
      "name": "Acme Co.",
      "email": "ap@acme.example",
      "address": [
        "42 Industrial Way",
        "Boulder, CO 80301"
      ]
    },
    "items": [
      {
        "description": "Website redesign, phase 1",
        "qty": 1,
        "unit_price": 2400
      },
      {
        "description": "Consulting (hours)",
        "qty": 10,
        "unit_price": 120
      },
      {
        "description": "Hosting, 12 months",
        "qty": 1,
        "unit_price": 180
      }
    ],
    "notes": "Payment due within 30 days. Thank you for your business!"
  }
}

2. Render it

curl -X POST https://api.slipkiln.com/v1/render/template \
  -H "Authorization: Bearer $SLIPKILN_KEY" \
  -H "Content-Type: application/json" \
  -d @invoice.json \
  -o invoice.pdf

You get back a PDF. Change brand.color and brand.name to match your business. All text is HTML-escaped. Need a custom layout? Send your own HTML to /v1/render/html.