This is the part I am having trouble with. Frontier::Client doesn't seem to allow me to do this!?

Use the Source, Luke, look inside

    $self->{'ua'} = LWP::UserAgent->new;
    $self->{'ua'}->proxy('http', $self->{'proxy'})
    if(defined $self->{'proxy'});
    $self->{'rq'} = HTTP::Request->new (POST => $self->{'url'});
    $self->{'rq'}->header('Content-Type' => 'text/xml');
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