Edit in JSFiddle

function go() {
  var map = new ol.Map({
    target: 'map',
    layers: [
      new ol.layer.GeoportalWMTS({
        layer: "ORTHOIMAGERY.ORTHOPHOTOS"
      })
    ],
    view: new ol.View({
      center: ol.proj.fromLonLat([2.294, 48.858]),
      zoom: 15
    })
  });

  var drawControl = new ol.control.Drawing({
    collapsed: false
  });
  map.addControl(drawControl);

}

Gp.Services.getConfig({
  apiKey: "jhyvi0fgmnuxvfv0zjzorvdn",
  onSuccess: go
});
#map {
  width: 100%;
  height: 400px;
}
<div id="map"></div>

External resources loaded into this fiddle: