my $object = Product::create( $data_ref );

if ($object->isa('Product::Real')) {
  &call_real_product_api( $object );
}
else {
  &call_potential_product_api( $object );
}

##</code><code>##

if (Product::isa_Real_Object( $data_ref )) {
  &call_real_product_code( $data_ref );
}
else {
  &call_potential_product_code( $data_ref );
}