$response is a reference to a hash blessed into the QMIResponse class (I couldn't find this module on CPAN). You can dereference with %$response for the whole hash, @{$response}{@slice_keys} for a hash slice or $response->{$key} for individual values.

However, before trying to access that data directly, look for methods provided by the QMIResponse class for doing this. Using the methods provided by the class means that $response->get_whatever() still works long after QMIResponse=HASH(0xe68d4d4) becomes QMIResponse=ARRAY(0xe68d4d4) or QMIResponse=SCALAR(0xe68d4d4).