使用GET的AJAX API

I am working on a block of code that will fire off an API if a checkbox is checked. I've tested the API and it works. I had the form functioning before turning it into a widget. (at least I think I did??)

So here is the script that won't GET form values when checked:

<script type="text/javascript">
(jQuery || $)(function($) {
$('#survessay-form').on('submit', function() {
    // the jquery element of the form
    var $this = $(this);

    if($this.find('input[type="checkbox"]').is('checked')) {
        $.ajax({
            type: "GET",
            url: `https://www.example.com/?cmd=api-co-reg&apik=ukp!BjItWgMi6Qk&Email=${$('#awf_field-95505011').val()}&FirstName=${$('#awf_field-95505010').val()}&aff_sid=emailcoreg&cmp=1320&cxid=242570`
        }).done(function(data) {
            data = data.result;
            $("#checkedmessage").html("<p>Thanks, " + data.name + ", you're now a Swagbucks participant!</p>");
            // continue to the confirmation page
        }).fail(function(data) {
            // verify data
            data = data.responseJSON;
            $("#errormessage").html("Error: Please check the format of your input");
        });
    }

    // stops probagation of event (doesn't submit the request to the php page)
    return false;
 });
});

So essential this should submit the API when the checkbox is checked and the user clicks the submit button but it continues on to the forms action method. Without submitting the request. What am I missing here?