The SOAP Binding Service is the method of transport used to convey identity data between web services. It includes a set of Java APIs used by the developer of a Liberty-enabled identity service. The APIs are used to send and receive identity-based messages using SOAP, an XML-based messaging protocol. The service invokes the correct request handler class (specified by a service endpoint) to handle the messages. For more information, see Chapter 9, SOAP Binding Service.