curl -X POST \
-H 'x-ti-app-id: 1234567890' \
-H 'x-ti-secret-code: 1234567890' \
-F 'file=@invoice.pdf'
-F 'file=@another.pdf'
'https://docflow.textin.com/api/app-api/sip/platform/v2/file/upload?workspace_id=1234567890&category=invoice&batch_number=202412190001'

{
  "code": 200,
  "message": "<string>",
  "result": {
    "batch_number": 202412190001,
    "files": [
      {
        "id": 202412190001,
        "name": "invoice.pdf",
        "format": "pdf"
      }
    ]
  }
}