The Customer APIs allow you to:

• Manage the customer addresses for a store. Customers can have multiple addresses, one of which is the default address that's used to calculate taxes and shipping charges.
• Add or update information about a store's customers, including their addresses and whether they have an active customer account with the store.
• Add or update customer saved searches. Saved searches help merchants to organize their customers into groups that they can access quickly from their admin. They're also useful for specifying sets of customers, such as the customers that are eligible to use a certain discount code.