Edit in JSFiddle

function go() {
    var map = new ol.Map({
        target: 'map',
        layers: [
            new ol.layer.Tile({
				source: new ol.source.GeoportalWMTS({
					layer: "ORTHOIMAGERY.ORTHOPHOTOS",
				}),
				opacity: 0.7
			})
        ],
        view: new ol.View({
            center: ol.proj.transform([2,48],"EPSG:4326","EPSG:3857"),
            zoom: 12,
        })
    });
}

Gp.Services.getConfig({
    apiKey: "jhyvi0fgmnuxvfv0zjzorvdn",
    onSuccess: go
});

var infoDiv= document.getElementById("info") ;
infoDiv.innerHTML= "<p> Extension OL3 version "+Gp.ol3extVersion+" ("+Gp.ol3extDate+")</p>" ;

<div id="map"></div>
<div id="info"></div>