use LWP::UserAgent;
use HTTP::Request;

my $json= '{" ..."}';
my $uri = "https://someurl/";
my $req = HTTP::Request->new( 'POST', $uri );
$req->header( 'Content-Type' => 'application/json' );
$req->header( 'Authorization' => 'bla bla' );
$req->content( $json );

my $ua = LWP::UserAgent->new(ssl_opts =>  { verify_hostname => 0 });
$ua->request($req);