XML::Simple Data::Dumper w Perl

Here is the code that reads in the XML file, parses it using XML::Simple and dumps the contents to screen:

use XML::Simple;
use Data:umper;

my $xml = "";

open(FILE, "sampleOrder.xml") || die "Cannot open data file";
while (<FILE>) {
$xml .= $_;
}
close FILE;

my $hashref = XMLin($xml);

print Dumper($hashref);

What I see is a bunch of embedded hashes similar to this:

$VAR1 = {
'Message' => [
{
'TestOrderRequest' => {
'FulfillmentData' => {
'FulfillmentServiceLevel' => 'Standard',
'PostalCode' => '98004',
'FulfillmentMethod' => 'Ship',
'FulfillmentCenterID' => '0'
},
'Item' => {
'SKU' => '1234',
'Quantity' => '2'
},
'BillingData' => {
'CreditCard' => {
'Issuer' => 'Visa'
},
'BuyerEmailAddress' => 'joesmith@hotmail.com'
}
},
'MessageID' => '1'
},

What I would like is a simple way to extract into variables that contain values, eg. $firstName = $myValues{'firstName'} Does anyone know how this can be done without having to know the tree structure of the hashes? Please forgive the newbieness...