Merge the content of two single page PDFs, on a pretty template, the other an invoice, into a new *single* page PDF, using Perl PDF::API2

merge.pl

#!/usr/bin/env perl

use strict;
use warnings;
use PDF::API2;

my ($template_pdf, $data_pdf) = @ARGV;

my $t_pdf = PDF::API2->open($template_pdf);
my $page = $t_pdf->openpage(1);
my $d_pdf = PDF::API2->open($data_pdf);
$t_pdf->importpage($d_pdf, 1, $page);
$t_pdf->saveas("merged-$data_pdf");
$t_pdf->end;