Add Google maps API key

  • Hi, i have version WP GPX Maps 1.3.3. I do not want a newer version without a Google maps.
    How and where to insert Google API key? https://maps.googleapis.com/maps/api/js?key=AIzaSyAt0GtXMIQh7siDrkNNmdj06FmPODFxvNg&callback=initMap in wp-gpx-maps.php not working. What is callback?

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