curl --request GET \
  --url https://api.spacebring.com/billing/invoices/v1/items/upcoming \
  --header 'Authorization: Basic <encoded-value>'

{
  "invoiceItems": [
    {
      "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>"
      }
    }
  ]
}