March 2, 2026 8 min read

    Invoice PDF API Workflow: Generate, Deliver, and Archive

    A practical architecture for invoice generation with reliability and auditability built in.

    Use a deterministic HTML template, pass structured invoice data, generate PDF, and store immutable artifacts for audit trails.

    Recommended pipeline

    1. Create invoice payload with immutable `invoice_id` and version.
    2. Render HTML template server-side.
    3. Call HTML to PDF API with `output_format=url`.
    4. Store final URL/hash in DB and send email webhook.
    5. Retry failed jobs with idempotency keys.

    Production checklist

    • Idempotency per invoice version
    • Retry with exponential backoff
    • PDF hash for tamper detection
    • Signed URL expiry strategy

    Ready to test this endpoint?

    Generate an API key and run it in the playground in under 60 seconds.