Check

Supported Methods	Supported Parameters
GET, POST, PATCH	Id, number, page, pageSize, modTimeStart, modTimeEnd, isDeleted

{
    "ID": "",
    "ToBePrinted": true,
    "Account": {
        "ID": "",
        "FullName": ""
    },
    "PayeeEntity": {
        "ID": "",
        "FullName": ""
    },
    "Address": {
        "Line1": "",
        "Line2": "",
        "Line3": "",
        "Line4": "",
        "Line5": "",
        "City": "",
        "State": "",
        "PostalCode": "",
        "Country": "",
        "Note": ""
    },
    "Date": "2021-06-04T20:17:13Z",
    "Number": "",
    "Memo": "",
    "Amount": 0.0,
    "ItemLines": [{
        "Item": {
            "ID": "",
            "FullName": ""
        },
        "Description": "",
        "Quantity": 0.0,
        "Cost": 0.0,
        "Amount": 0.0,
        "Customer": {
            "ID": "",
            "FullName": ""
        },
        "IsBillable": "",
        "Class": {
            "ID": "",
            "FullName": ""
        },
        "ID": ""
    }],
    "AccountLines": [{
        "Account": {
            "ID": "",
            "FullName": ""
        },
        "Amount": 0.0,
        "Memo": "",
        "Customer": {
            "ID": "",
            "FullName": ""
        },
        "IsBillable": "",
        "Class": {
            "ID": "",
            "FullName": ""
        },
        "ID": ""
    }],
    "ExchangeRate": 0.0,
    "LinkedTransactions": [{
        "ID": "",
        "Amount": 0.0,
        "Type": "",
        "Date": "2021-06-04T20:17:13Z",
        "Number": ""
    }],
    "LastModifiedDate": "2021-06-04T20:17:13Z",
    "DeletedDate": "2021-06-04T20:17:13Z",
    "AmountInHomeCurrency": 0.0,
    "Currency": {
        "ID": "",
        "FullName": ""
    }
}

Important Notes

QuickBooks Desktop

When POSTing a Check to QuickBooks:

If you are not including a customer when sending in a check, you will need to omit IsBillable.
If you are sending in a customer, IsBillable must be set to true or false.