curl -X POST https://api.getdeckle.dev/v1/generate/batch \
  -H "Authorization: Bearer dk_live_sk_..." \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: batch-invoice-run-2026-03" \
  -d '{
    "items": [
      {
        "template": "tmpl_abc123",
        "data": { "company": "Acme Corp", "total": 1500 }
      },
      {
        "template": "tmpl_abc123",
        "data": { "company": "Globex Inc", "total": 2300 }
      },
      {
        "html": "<h1>Custom Report</h1><p>Summary data here.</p>",
        "options": { "format": "Letter", "orientation": "landscape" }
      }
    ],
    "webhook": "https://example.com/webhooks/batch-complete"
  }'

{
  "batch_id": "batch_a1b2c3d4e5f6g7h8",
  "total": 3,
  "generations": [
    { "id": "gen_abc123", "index": 0 },
    { "id": "gen_def456", "index": 1 },
    { "id": "gen_ghi789", "index": 2 }
  ],
  "status": "queued"
}