The editor takes a single JSON object that describes one document — an invoice, receipt, quote, refund, or cancellation. The most important fields are:

• document_type — what kind of document to render
• seller and customer — parties on the document
• items — line items with description, quantity, and unit price
• currency, tax, discount, total — money fields and breakdown

Numeric fields accept either a JSON number or a numeric string. Dates use YYYY-MM-DD. Currency is an ISO 4217 code such as USD or EUR.

For the full field reference and per-document-type rules, see the Invoice PDF API documentation.