The redirect URI in the request, https://oratoriomoretta.it/?option=com_slogin&task=check&plugin=google, does not match the ones authorized for the OAuth client. To update the authorized redirect URIs, visit: https://console.developers.google.com/apis/credentials/oauthclient/1037648484027-vt8vrpgms8mqvscmv6fomid8gc5vgv1f.apps.googleusercontent.com?project=1037648484027