foreach my $asset_type ( keys %{$response} ) {  
  $logger->debug("Starting asset_type $asset_type");
  my $i = 0;
  while ($response->{$asset_type}->[$i]) {
    $logger->debug("\t$asset_type $i:");
    foreach my $param ( keys %{($response->{$asset_type}->[$i])})  { # each $i is a hash ref
      $logger->debug("\t\t$param = $response->{$asset_type}->[$i]->{$param}->[0]");
    }
    $i++;
  }
}