**What** - Catches unique constraints on customer_id, is_default_billing/is_default_shipping and reformats - Adds an step to create and update of addresses that unsets the previous default shipping/billing address if necessary. - This creates a behavior in the API where you can always set an address to be default and it will automatically unset the previous one for you.
Customer Module
Customers represent entities who can make purchases in a store.
Features
- The customer module enables you to store your customers’s contact details.
- The customer module enables you to group your customers.