ventlabel — Labelary-compatible ZPL rendering API

Authentication: X-API-Key header (required)
POST /v1/printers/{dpmm}/labels/{width}x{height}/{index}
GET  /v1/printers/{dpmm}/labels/{width}x{height}/{index}/{zpl}
Viewer: /viewer
Virtual printer: TCP 9100 (raw ZPL) — archive at /jobs