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For example, if you wanted to access a COD buffer stream you would pass a 411.
$t->label('COD.png', 411);

=item $t->lookup('tracking_number')

This method will return the value for an item returned from FedEx.  Refer to
the C<Business::FedEx::Constants> %FE_RE hash to see all possible values.

=item $t->rbuf()

Returns the decoded string portion of the FedEx reply.

=item $t->hash_ret()

Returns a hash of the FedEx reply values

    my $stuff= $t->hash_ret;

    foreach (keys %{$stuff}) {
        print $_. ' => ' . $stuff->{$_} . "\n";
    }