There's a JSON API endpoint (/api/meals/barcode/{barcode}) that looks up a meal by barcode value, separate from the admin POS scanning flow, and it requires the POS module to be enabled. In the current version this endpoint isn't called from any front-end page or script found in the codebase, so it doesn't appear to power a live customer-facing barcode lookup yet — it may exist for a future feature or an external integration.