curl --request POST \
  --url https://demoapi.saasphereltd.com/api/v1/utils/upload-document \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form customer_id=CUST001 \
  --form document_type_id=1 \
  --form file='@example-file'

{
  "status": "00",
  "message": "Document uploaded successfully",
  "data": {}
}