This module provides a Japan postal code data and API for them. This fetches the csv file from Japan post office website and insert it into the local database table. After fetching the data, it doesn't depend on any external service and so speedy.
For now, this fetch process may fail with timeout error because it takes a so long time (over 1 minutes depending on the environment) but it doesn't split the process into queue tasks.
This module is only for developers. It provides only several simple APIs and doesn't provide any end-user functionality.