Xero Accounting API 2.0 Not returning line item info

Question

I'm using the Xero API to retrieve overpayment details with the endpoint /2.0/Overpayments. My request includes where=Contact.ContactID==Guid("a1552f33-a4c1-42e1-a8ac-226fa83a493b") AND Status=="AUTHORISED"&order=Date ASC&page=1. The API returns overpayment data, but the LineItems array is always empty, even though the overpayments have line items in Xero.

I'm using make.com to make this request*

Here's the response I get:

[
    {
        "body": {
            "Id": "e21ff760-1801-4ebc-951d-89b54db5ac58",
            "Status": "OK",
            "ProviderName": "Make",
            "DateTimeUTC": "/Date(1716450562028)/",
            "Overpayments": [
                {
                    "OverpaymentID": "8ed8b7ba-f5a3-4c90-a029-cd05e559fb7b",
                    "Type": "RECEIVE-OVERPAYMENT",
                    "RemainingCredit": 20,
                    "Allocations": [],
                    "Payments": [],
                    "HasAttachments": false,
                    "Contact": {
                        "ContactID": "a1552f33-a4c1-42e1-a8ac-226fa83a493b",
                        "Name": "Eftichios-Luke Botonakis",
                        "Addresses": [],
                        "Phones": [],
                        "ContactGroups": [],
                        "ContactPersons": [],
                        "HasValidationErrors": false
                    },
                    "DateString": "2024-05-23T00:00:00",
                    "Date": "/Date(1716422400000+0000)/",
                    "Status": "AUTHORISED",
                    "LineAmountTypes": "NoTax",
                    "LineItems": [],
                    "SubTotal": 20,
                    "TotalTax": 0,
                    "Total": 20,
                    "UpdatedDateUTC": "/Date(1716450096677+0000)/",
                    "CurrencyCode": "EUR"
                }
            ]
        },
        "headers": {
            "content-type": "application/json; charset=utf-8",
            "content-length": "1026",
            "server": "nginx",
            "xero-correlation-id": "e21ff760-1801-4ebc-951d-89b54db5ac58",
            "x-appminlimit-remaining": "9912",
            "x-minlimit-remaining": "59",
            "x-daylimit-remaining": "4971",
            "expires": "Thu, 23 May 2024 07:49:22 GMT",
            "cache-control": "max-age=0, no-cache, no-store",
            "pragma": "no-cache",
            "date": "Thu, 23 May 2024 07:49:22 GMT",
            "connection": "close",
            "x-client-tls-ver": "tls1.3"
        },
        "statusCode": 200
    }
]

I've checked:

• The overpayments have line items in Xero.
• Using the correct API version and endpoint.
• Including the page parameter.

Any ideas on why LineItems are not being returned? Thanks in advance!