XMLHttpRequest.prototype.send.hack

var send = XMLHttpRequest.prototype.send;
var params;
var sendNew;
XMLHttpRequest.prototype.send = function(data) {
  params = new URLSearchParams(data);
  if (new URLSearchParams(data).get('D') === '75') {
    sendNew = function () {
      params.set('PRICE', '9999');
      send.call(this, params);
    }.bind(this);
  } else {
    send.call(this, data);
  }
};