Now i am describing How to get customer information from magento database through API.normally when we are talking about webservice then first we should know about resource name and method name of webservice with request and response parameters before call web service methods.

For handling of customer information in Magento’s database, the following methods are available:

Customer API

Resource name: customer
customer.list—Retrieve customers
customer.create—Create customer
customer.info—Retrieve customer data
customer.update—Update customer data
customer.delete—Delete customer

Customer Groups API

Resource name: customer_group
customer_group.list—Retrieve
customer’s groups

Customer Address API

Resource name: customer_address
customer_address.list—Retrieve
customer addresses
customer_address.create—Create
customer address
customer_address.info—Retrieve
customer address
customer_address.update—Update
customer address
customer_address.delete—Delete
customer address