curl --request POST \
  --url https://api.iotools.cloud/v1/tool/invoice-total-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "subtotal": "1000",
  "discountPercent": "10",
  "discountTiming": "before",
  "taxPercent": "8",
  "shipping": "50"
}
'

{
  "tool": "invoice-total-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "summary": [
      {
        "line": "Subtotal",
        "amount": "$1,000.00"
      },
      {
        "line": "Discount (before tax)",
        "amount": "-$100.00"
      },
      {
        "line": "Taxable Amount",
        "amount": "$900.00"
      },
      {
        "line": "Tax",
        "amount": "$72.00"
      },
      {
        "line": "Shipping / Handling",
        "amount": "$50.00"
      },
      {
        "line": "Grand Total",
        "amount": "$1,022.00"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}