How to set Google Maps api in QML - qt

Question

I'm having problem probably setting Google Maps Api in my code. My program needs to use google map satellite view and I have to add merkers, draw lines and other stuff like this. This is the code:
import QtQuick 2.7
import QtQuick.Controls 1.4
import QtQuick.Window 2.0
import QtLocation 5.6
import QtPositioning 5.6
Rectangle {
id: mainWindow
width: 512
height: 512
visible: true
ListModel{
id:dummyModel
ListElement {
Latitude: 47.212047
Longitude: -1.551647
Label: "something"
Orientation: 0
Color:"transparent"
}
}
Plugin {
id: googleMaps
name: "googlemaps" // "mapboxgl", "esri", ...
// specify plugin parameters if necessary
PluginParameter {
name:"googlemaps.maps.apikey"
value:"<*********************>" // here is the problem
}
}
Map {
id: myMap
anchors.fill: parent
plugin: googleMaps
activeMapType: supportedMapTypes[1]
center: QtPositioning.coordinate(59.91, 10.75) // Oslo
zoomLevel: 14
MapItemView{
id:dynamicMapObject
model: dummyModel
delegate: MapQuickItem {
coordinate: QtPositioning.coordinate(Latitude,Longitude)
sourceItem: Text{
width: 100
height: 50
text: model.Label
rotation: model.Orientation
opacity: 0.6
color: model.Color
}
}
}
MapPolyline {
line.width: 3
line.color: 'green'
path: [
{ latitude: 59.92, longitude: 10.77 },
{ latitude: 59.96, longitude: 10.78 },
{ latitude: 59.99, longitude: 10.76 },
{ latitude: 59.95, longitude: 10.74 }
]
}
MapCircle {
//a static item (fixed real dimension) always at 100m east of the map center
id:prova
center: myMap.center.atDistanceAndAzimuth(100,90)
opacity:0.8
color:"red"
radius:30
}
}
MouseArea {
anchors.fill: parent
acceptedButtons: Qt.RightButton
onClicked: {
if (mouse.button === Qt.RightButton)
{
dummyModel.append({
"Latitude": myMap.toCoordinate(Qt.point(mouseX,mouseY)).latitude ,"Longitude": myMap.toCoordinate(Qt.point(mouseX,mouseY)).longitude ,
"Label": "abc" , "Color": "red",
"Orientation":Number(3), })
}
}
}
Button{
id:buttonMap
text:"Click to add name"
onClicked: {
if(buttonMap.text == "Click to add name")
{
buttonMap.text = "Click to cancel name"
myMap.activeMapType = myMap.supportedMapTypes[3]
}
else
{
buttonMap.text = "Click to add name"
myMap.activeMapType = myMap.supportedMapTypes[1]
}
}
}
GroupBox{
title:"map types"
ComboBox{
model:myMap.supportedMapTypes
textRole:"description"
onCurrentIndexChanged: myMap.activeMapType = myMap.supportedMapTypes[currentIndex]
}
}
}
When I compile the code in debug Mode everything works, but in release nothing is shown. Of course it's a problem of google api key. Does somebody know how to add them? I tried following this topic (https://forum.qt.io/topic/66725/open-source-map-plug-in-for-qml/24), but I can't get it works.
I also tried all the google maps api key available here (https://developers.google.com/maps/web/) but none of them works.
Does somebody know which api key is the correct one from the above for my purpose?
Am I missing something in the plugin parameters?
Thank you in advance!