When I used the DataTables Editor custom ajax call, the only parameter that wasn't undefined was data. Why isn't method "POST" when creating a new row in Editor?

     d = JSON.parse(JSON.stringify(data));
        let { cust_id, username, password, account_type_id} = d.data[0];

        data = {
            username,
            password,
            account_type_id
        };

        if(method === "POST"){
            url = `${_config.apis.dti1ticketapps.credentials1ticket}/${cust_id}`
        } else {
            url = `${_config.apis.dti1ticketapps.credentials1ticket}/${cust_id}/${account_type_id}`
        }

        $.ajax( {
            type: method,
            url:  url,
            ...(method !== 'DELETE' && {data}),
            headers: { 'x-api-key': _config.apis.dti1ticketapps.token},
            dataType: "json",
            success: function (json) {
                success( json );
            },
            error: function (xhr, error, thrown) {
                error( xhr, error, thrown );
            }
        } );
    };

    Window.systemsManager.editor = editor = new $.fn.dataTable.Editor({
        dom: "Bfrtip",
        idSrc:  'cust_account_id',
        ajax: credentialsFunc,
        table: "#transferTable",
        fields: [
            {
                label: "Id",
                name: "cust_account_id",
                type:  "hidden"
            },
            {
                label: "Type",
                name: "account_type_id",
                type: "select2"
            },
            {
                label: "Username",
                name: "username"
            },
            {
                label: "Password",
                name: "password"
            },
            {
                label: "Location",
                name: "account_location"
            }
        ]
    });