curl -X POST https://api.getdeckle.dev/v1/pdf/merge \
  -H "Authorization: Bearer dk_live_sk_..." \
  -H "Content-Type: application/json" \
  -d '{
    "pdfs": [
      "<base64-encoded-pdf-1>",
      "<base64-encoded-pdf-2>"
    ],
    "output": "url"
  }'

{
  "url": "https://cdn.getdeckle.dev/gen_abc123.pdf",
  "file_size": 102400
}

{
  "data": "<base64-encoded-merged-pdf>",
  "file_size": 102400
}