curl --request POST \
  --url https://api.iotools.cloud/v1/tool/paper-size-converter \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "paperSize": "a4",
  "orientation": "portrait",
  "dpi": "96"
}
'

{
  "tool": "paper-size-converter",
  "tool_version": "1.0.1",
  "outputs": {
    "resultTable": [
      {
        "unit": "Millimeters (mm)",
        "width": "210.0",
        "height": "297.0"
      },
      {
        "unit": "Centimeters (cm)",
        "width": "21.00",
        "height": "29.70"
      },
      {
        "unit": "Inches (in)",
        "width": "8.27",
        "height": "11.69"
      },
      {
        "unit": "Points (pt)",
        "width": "595.3",
        "height": "841.9"
      },
      {
        "unit": "Pixels @ 96 DPI",
        "width": "794",
        "height": "1123"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}