curl --request POST \
  --url https://api.pictify.io/templates/{uid}/batch-render \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "variableSets": [
    {}
  ],
  "format": "png",
  "quality": 0.9,
  "concurrency": 5
}
'

{
  "batchId": "<string>",
  "status": "pending",
  "totalItems": 123,
  "message": "<string>"
}