{
  "id": "bank_doc_02",
  "source_image": "image/guarantee/image copy.png",
  "document_type": "bank_letter_of_guarantee",
  "pages": [
    {
      "page": 1,
      "page_size": [1024, 559],
      "dpi": 300,
      "signature_boxes": [
        {
          "id": "sig1",
          "x1": 150,
          "y1": 434,
          "x2": 420,
          "y2": 458,
          "role": "Bank Representative",
          "name": "Michael Chen"
        }
      ]
    }
  ]
}