#!/usr/bin/perl

use strict;
use warnings;
use Data::Dumper;

my @x = (
         {
           'date' => '2001-06-04',
           'number' => '12345',
           'amount' => '100.00',
           'status' => 'paid',
           'type' => 'new'
         },
         {
           'date' => '2000-001-02',
           'number' => 'xc234',
           'amount' => '30.88',
           'status' => 'new',
           'type' => 'cost'
         }
       );

my @y = (
     {
       'ppay' => 'Smith Doe'
     }
   );

my @z = (
       {
         'deb1' => '0',
         'cred' => '0',
         'addr' => '100 - Main Street',
         'total' => '250.00 usd',
       },
       {
         'deb1' => '0',
         'cred' => '50.14',
         'addr' => '1 - Central',
         'total' => '51.00',
       }
     );
 
print "This replicates your dumper output:\n";
print Dumper \@x,\@y,\@z;

#This is what you need in your source code:
my @combined = (@x,@y,@z);

print "\n####### Desired Dumper Output ####\n";
print Dumper \@combined;

__END__
This replicates your dumper output:
$VAR1 = [
          {
            'type' => 'new',
            'status' => 'paid',
            'amount' => '100.00',
            'number' => '12345',
            'date' => '2001-06-04'
          },
          {
            'number' => 'xc234',
            'date' => '2000-001-02',
            'amount' => '30.88',
            'status' => 'new',
            'type' => 'cost'
          }
        ];
$VAR2 = [
          {
            'ppay' => 'Smith Doe'
          }
        ];
$VAR3 = [
          {
            'addr' => '100 - Main Street',
            'total' => '250.00 usd',
            'cred' => '0',
            'deb1' => '0'
          },
          {
            'addr' => '1 - Central',
            'total' => '51.00',
            'cred' => '50.14',
            'deb1' => '0'
          }
        ];

####### Desired Dumper Output ####
$VAR1 = [
          {
            'type' => 'new',
            'status' => 'paid',
            'amount' => '100.00',
            'number' => '12345',
            'date' => '2001-06-04'
          },
          {
            'number' => 'xc234',
            'date' => '2000-001-02',
            'amount' => '30.88',
            'status' => 'new',
            'type' => 'cost'
          },
          {
            'ppay' => 'Smith Doe'
          },
          {
            'addr' => '100 - Main Street',
            'total' => '250.00 usd',
            'cred' => '0',
            'deb1' => '0'
          },
          {
            'addr' => '1 - Central',
            'total' => '51.00',
            'cred' => '50.14',
            'deb1' => '0'
          }
        ];