Update minicart after adding product with ajax button

I’m using the code bellow to add a product with quantity to cart via ajax

function addToCart(p_id,q_td) {
            jQuery.ajax({
              type: 'POST',
              url: '?post_type=product&add-to-cart='+p_id,
              data: { 'product_id':  p_id,
                            'quantity': q_td},
              success: function(response, textStatus, jqXHR){

                    console.log("Product added");
                }
              //dataType: 'JSON'
            });
        }
        jQuery('#buybtn').click(function(e) {
          e.preventDefault();
          addToCart(<?php echo $post->ID;?>,jQuery("#qtd").val());
          return false;
        });

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What I need is to update minicart on sucess

How can do it? The link bellow gives a clue, but how can I put “add_to_cart_fragments” to work on ajax?

https://wcdocs.woothemes.com/snippets/show-cart-contents-total/

https://www.ads-software.com/extend/plugins/woocommerce/