Writing Custom Callback for ajax

In this post, I will share how could you use callbacks to write efficient and maintainable ajax using callbacks. Promises can also be use but here i will discuss it with callbacks.
The definition of callback is
A reference to executable code, or a piece of executable code, that is passed as an argument to other code. 
Let's see an example code of custom callback,
function test(param1, param2, callback) {
    alert('Started function.\n\nIt has: ' + param1 + ', ' + param2);
test('foo', 'bar', function() {
    alert('Finished function.');
Now I will share the code where you can leverage the callbacks for ajax and maintainable code.
function ajaxGetData(formId, callback) {
        url: "/FormController/GetDataFromDb",
        type: "POST",
        dataType: "json",
        data: {
            id: formId
        success: function (data, status, xhr) {

ajaxGetData(123, function(data) {

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