curl --request POST \
  --url https://api.spacebring.com/billing/invoices/v1/items \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "invoiceItem": {
    "quantity": 123,
    "unitAmount": 1,
    "companyRef": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "description": "<string>",
    "discounts": [
      {
        "couponRef": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
      }
    ],
    "invoiceRef": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "membershipRef": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "product": {
      "optionRef": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "title": "<string>"
    },
    "subscriptionRef": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "tax": {
      "rate": 1
    },
    "type": "custom"
  }
}
'

{
  "invoiceItem": {
    "amount": 123,
    "baseAmounts": {
      "currencyCode": "<string>",
      "discountedAmount": 123,
      "totalAmount": 123,
      "totalExcludingTaxAmount": 123,
      "unitAmount": 123,
      "unitExcludingTaxAmount": 123,
      "tax": {
        "amount": 123,
        "inclusive": true,
        "rate": 123,
        "taxableAmount": 123
      }
    },
    "createDate": "2023-11-07T05:31:56Z",
    "currencyCode": "<string>",
    "description": "<string>",
    "discountedAmount": 123,
    "discounts": [
      {
        "coupon": {
          "amountOff": 123,
          "currencyCode": "<string>",
          "duration": "<string>",
          "durationInMonths": 123,
          "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
          "percentOff": 123,
          "productTypes": [
            "<string>"
          ],
          "type": "<string>"
        },
        "promocode": {
          "code": "<string>",
          "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
          "expiration": "2023-11-07T05:31:56Z",
          "limitByFirstPurchase": true
        },
        "subscriptionId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
      }
    ],
    "id": "<string>",
    "locationRef": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "netAmount": 123,
    "netUnitAmount": 123,
    "product": {
      "title": "<string>",
      "bookingRef": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "eventTicketRef": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "optionRef": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "orderRef": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
    },
    "quantity": 0,
    "totalAmount": 123,
    "totalExcludingTaxAmount": 123,
    "type": "<string>",
    "unitAmount": 123,
    "unitExcludingTaxAmount": 123,
    "booking": {},
    "companyRef": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "creditPackage": {},
    "deleteDate": "2023-11-07T05:31:56Z",
    "invoiceRef": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "membershipRef": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "membershipRefCreatedBy": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "orderItem": {},
    "period": {
      "endDate": "2023-11-07T05:31:56Z",
      "startDate": "2023-11-07T05:31:56Z"
    },
    "plan": {},
    "subscriptionRef": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "tax": {
      "amount": 123,
      "inclusive": true,
      "rate": 123,
      "taxableAmount": 123
    },
    "taxAmount": 123,
    "taxableAmount": 123,
    "ticket": {},
    "userCreatedBy": {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "name": "<string>",
      "surname": "<string>"
    }
  }
}