curl --request POST \
  --url https://api.iotools.cloud/v1/tool/split-bill-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "subtotal": "100",
  "taxAmount": "0",
  "discount": "0",
  "tipPreset": "custom",
  "tipPercent": "15",
  "numPeople": "2",
  "currency": "USD",
  "roundUp": ""
}
'

{
  "tool": "split-bill-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "breakdown": [
      {
        "metric": "Subtotal",
        "value": "$100.00"
      },
      {
        "metric": "Tax",
        "value": "$0.00"
      },
      {
        "metric": "Discount",
        "value": "$0.00"
      },
      {
        "metric": "Tip (15%)",
        "value": "$15.00"
      },
      {
        "metric": "Total",
        "value": "$115.00"
      },
      {
        "metric": "People",
        "value": "2"
      }
    ],
    "perPerson": [
      {
        "person": "Person 1",
        "amount": "$57.50"
      },
      {
        "person": "Person 2",
        "amount": "$57.50"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}