Overrides the --call method to also look for incoming posts of type “post_type_name” when attempting to call a method of the form “incoming_[post_type_name_plural_form]” or the first incoming post of “post_type_name” when trying to call “incoming_[post_type_name]”. This is harder to explain that to demonstrate, please see the example.

Note: this method is not intended to be called directly.