Execute a document processing step asynchronously

{
  "id": "cm5vm9hx30001m5cgh0p9v8qa",
  "status": "ENQUEUED",
  "step_id": "cm5vm9hx30001m5cgh0p9v8qb",
  "step_name": "Invoice Processing"
}

{
  "message": "Validation error",
  "errors": [
    "string"
  ]
}

{
  "error": "Invalid API key"
}

{
  "message": "Step not found or access denied"
}

{
  "message": "Step not found or access denied"
}

{
  "message": "URL download timeout (30000ms)"
}

{
  "message": "File exceeds maximum allowed size (100MB)"
}

{
  "message": "Unsupported Content-Type. Use multipart/form-data or application/json."
}

{
  "error": "Rate limit exceeded",
  "limitType": "minute",
  "limit": 0,
  "remaining": 0,
  "resetTime": 0,
  "retryAfter": 0
}

{
  "message": "Internal server error: Failed to initiate step processing"
}