use v5.014;
use JSON;
use Mojo::JSON::Pointer;

# reconstructing a JSON response from your Dump
my $json = to_json( get_response() ); # your client request gets this

# converting your API response to a Perl struct
my $data = from_json( $json ); # your client should provide this

# converting the elements to JSON pointer paths
my @elements = map {s!\.!/!gr} (qw/ userName displayName meta.created /);

for my $item ( @{ $data->{Resources} } ) {
    my $pointer = Mojo::JSON::Pointer->new( $item );

    foreach my $element (@elements) {
        say "$element: " . $pointer->get('/' . $element);
    }

    say '';
}

sub get_response {
    return {
       'Resources' => [{
                             'displayName' => 'User 1',
                             'userName' => 'user1@test.com',
                             'id' => '1234567',
                             'meta' => {
                                         'created' => '2018-04-16T11:57:19.376Z'
                                       }
                           },
                           {
                             'displayName' => 'User 2',
                             'userName' => 'user2@test.com',
                             'id' => '1234568',
                             'meta' => {
                                         'created' => '2018-04-16T11:59:27.111Z'
                                       }
                           },
                           {
                             'displayName' => 'User 3',
                             'userName' => 'user3@test.com',
                             'id' => '12345679',
                             'meta' => {
                                         'created' => '2018-11-21T14:49:33.821Z'
                                       }
                           },
                         ],
          'totalResults' => 3,
          'itemsPerPage' => 50,
          'startIndex' => 1,
          'schemas' => [
                         'urn:ietf:params:scim:api:messages:2.0:ListResponse'
                       ]
    };
}

__END__

##</code><code>##

perl 1226873.pl

userName: user1@test.com
displayName: User 1
meta/created: 2018-04-16T11:57:19.376Z

userName: user2@test.com
displayName: User 2
meta/created: 2018-04-16T11:59:27.111Z

userName: user3@test.com
displayName: User 3
meta/created: 2018-11-21T14:49:33.821Z