How do I track direct mail and promotional package deliveries by API?

curl -X POST https://api.lastscanned.com/v1/watches \
  -H "Authorization: Bearer lsk_live_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"trackingNumbers": ["1Z000Y770414233027", "541270563758"], "metadata": {"campaign": "q4-mailer"}}'

const counts = {};
let cursor;
do {
  const url = new URL("https://api.lastscanned.com/v1/watches");
  url.searchParams.set("limit", "100");
  if (cursor) url.searchParams.set("cursor", cursor);
  const res = await fetch(url, { headers: { Authorization: `Bearer ${process.env.LASTSCANNED_KEY}` } });
  const page = await res.json();
  for (const w of page.watches) {
    const campaign = w.metadata?.campaign ?? "none";
    const status = w.result?.status ?? "pending";
    (counts[campaign] ??= {})[status] = (counts[campaign][status] ?? 0) + 1;
  }
  cursor = page.nextCursor;
} while (cursor);
console.table(counts);