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GET billing/invoices/:id/document?format=thermal renders a dedicated 80mm receipt template (72mm printable, 4mm margins each side), not a CSS variant of the A4 layout — the A4 CSS is absolutely-positioned/fixed-px, tuned for a 210mm page, and doesn't reflow at thermal width. No seal (not a thermal convention, renders badly on 1-bit thermal heads); line items stack (description, then qty x rate = amount) instead of a table, since a real table leaves ~10-14 chars for description at this width. PdfRenderService gains a thermal render path: full 80mm-width viewport, content height measured via page.evaluate after settle (continuous-roll receipts have no fixed page length), and a noFallback option — a Chromium failure throws a clear error instead of silently degrading to the generic A4/no-QR fallback, which would hand back a different document than what was asked for. The frontend surfaces that as a toast pointing at the existing A4 download. format is strictly validated (a4|thermal only, BadRequestException otherwise), not silently coerced. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>