curl --request POST \
  --url https://api.iotools.cloud/v1/tool/gpa-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "courses": "Biology, A, 4\nCalculus, B+, 3\nHistory, C, 3",
  "scale": "4.0"
}
'

{
  "tool": "gpa-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "result": [
      {
        "metric": "Weighted GPA",
        "value": "3.19"
      },
      {
        "metric": "Total Credit Hours",
        "value": "10"
      },
      {
        "metric": "Total Quality Points",
        "value": "31.90"
      },
      {
        "metric": "Courses Counted",
        "value": "3"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}