curl --request PUT \
  --url https://api.useaira.com/v1/invoices/{invoiceId}/line-items/{lineItemId} \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --data '
{
  "startDate": "2023-12-25",
  "endDate": "2023-12-25",
  "amount": 123,
  "name": "<string>",
  "subLineItems": [
    {
      "usage": 123,
      "amount": 123
    }
  ]
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "idempotencyKey": "<string>",
  "customerId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "productId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "resourceId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "lineItemGroupId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "name": "<string>",
  "startDate": "2023-12-25",
  "endDate": "2023-12-25",
  "totalUsage": 123,
  "subtotalAmount": 123,
  "adjustmentAmount": 123,
  "totalAmount": 123,
  "discountAmount": 123,
  "metadata": {
    "type": "metric"
  },
  "subLineItems": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "name": "<string>",
      "description": "<string>",
      "usage": 123,
      "amount": 123,
      "metadata": {
        "type": "fixed_price",
        "fixedPrice": 123
      }
    }
  ],
  "adjustments": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "name": "<string>",
      "amount": 123
    }
  ],
  "itemId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}