foreach my $key ( %${hashref} ){
    ....
}

##</code><code>##

product name 1
HASH(0xffffffff)
product name 2
HASH(0xffffffff)

##</code><code>##

for my $key (keys %$hashref) {

##</code><code>##

    print $key->{'ProductName'}

##</code><code>##

    print $hashref->{$key}{ProductName};