Perl SDK - Start Discovery - PluginConfigurations

How can I find what is the least amount of XML to pass to PluginConfigurations?

Here is what I pass: and I get a bad_request error. Basically what I need to know is the bare min, I want to pass a IP address to StartDiscovery and then point it to an already existing Discovery Profile, do not want to create one.

  my $discoveryProfileXml = <<"END";

<CorePluginConfigurationContext xmlns:i='http://www.w3.org/2001/XMLSchema-instance' xmlns='http://schemas.solarwinds.com/2012/Orion/Core'>

         <BulkList>

         <string>$ipAddress</string>

         </BulkList>

        <IpRanges />

        <Subnets />

        <Credentials />

        <WmiRetriesCount>0</WmiRetriesCount>

        <WmiRetryIntervalMiliseconds>0</WmiRetryIntervalMiliseconds>

    </CorePluginConfigurationContext>

END

*****************************************

my @pluginConfigurationItems = ({ PluginConfigurationItem => "$discoveryProfileXml" });

            my %startDiscoveryConfiguration = (

                    Name => 'Production Profile 1' ,

                    EngineID => $engineID,

                    JobTimeoutSeconds => 3600,

                    SearchTimeoutMiliseconds => 2000,

                    SnmpTimeoutMiliseconds => 3000,

                SnmpRetries => 1,

                RepeatIntervalMiliseconds => 1800,

                SnmpPort => 161,

                HopCount => 0,

                PreferredSnmpVersion => 'SNMP2c',

                DisableIcmp => 0,

                AllowDuplicateNodes => 1,

                IsAutoImport => 1,

                IsHidden => 0,

                PluginConfigurations => \@pluginConfigurationItems

            );

            my @verbArguments = (\%startDiscoveryConfiguration);

            my $SWServer = $self->{engineconfig}->{OrionConfig}->{"$Region"};

            my $swhostname = $SWServer->{OrionServer}; # fill in a hostname

            my $swport = $SWServer->{JSONPort};

            my $swprotocol = $SWServer->{Protocol};

            my $SWCredentials = $self->get_credentials($SWServer->{CredentialSetName});

            my $username = $SWCredentials->{username};

            my $password = $self->decrypt_password($SWCredentials->{password});

            my $uri = "https://$swhostname:$swport/SolarWinds/InformationService/v3/Json/Invoke/Orion.Discovery/StartDiscovery";

            my $rest = REST::Client->new();

            $rest->getUseragent()->proxy(['https']);

            $rest->getUseragent()->ssl_opts(verify_hostname => 0);

            my $headers = {

                Authorization => 'Basic ' . MIME::Base64::encode_base64($username . ':' . $password),

                'Content-Type' => 'application/json'

            };

            my $json = JSON->new->allow_nonref->utf8;

             my $json_text = $json->space_after->encode(\@verbArguments);

            #print "$json_text\n";

            my $response = $rest->POST($uri, $json_text, $headers);

            print Dumper $response;