Restaurant POS Example

Quick answer

Commit an order version, calculate the production delta, create one job per station, and use a deterministic key. Print the guest receipt from the paid order snapshot, not from the kitchen ticket.

function createStationJobs(order: OrderVersion, previous?: OrderVersion) {
  const changed = productionDelta(previous, order);
  return groupByStation(changed).map(([stationId, items]) => ({
    id: `${order.id}:${order.version}:production:${stationId}`,
    kind: "production-ticket",
    stationId,
    orderId: order.id,
    orderVersion: order.version,
    items
  }));
}

Example sequence:

1. Order 42 version 1 sends food to Kitchen and drinks to Bar.
2. Version 2 adds one dessert; only the dessert delta prints.
3. A void creates a clearly labeled cancellation ticket.
4. Payment completion creates a separate guest-receipt job.

The dispatcher persists jobs before submission, maps stations to configured printers, and records attempts. A disconnect after submission leaves the job unknown until reconciled; it does not automatically create a new job.

// Portix adapter methods and status mapping aren't documented yet.
await dispatcher.submit(job);

Verify

• Modifiers and voids are unmistakable.
• Retrying a version does not duplicate it.
• Station fallback requires authorization.
• Payment and production printing fail independently.