I'm using the callback() function in the ajax option to populate the data, but I'm not sure what I'm doing wrong. I'm following the format from https://datatables.net/extensions/searchpanes/serverside, but am wondering if the key is in the right place.

SearchPanes is loading, but I get the message "No SearchPanes", which makes me think that the searchPanes key in the callback isn't right.

ajax: (params, callback, settings) => {

    // hardcode the options for this example.
    options = {
        code: {
            label: 'code',
            value: 'code',
            count: 3,
            total: 3
        }
    };

    // should something else be set here?
    let searchPanes = {
        options: options
    };


    let callbackValues = {
        draw: params.draw,
        data: d,
        searchPanes: searchPanes,
        recordsTotal: total,
        recordsFiltered: total, //  itemsReturned,
    }
    callback(callbackValues);