English: Go to <a href="https://developers.google.com/maps/documentation/javascript/get-api-key" target="_blank">https://developers.google.com</a> and generate the API key.
Dutch: Ga naar <a href="https://developers.google.com/maps/documentation/javascript/get-api-key" target="_blank">https://developers.google.com</a> en en genereer de API-sleutel.