A service operation in the PeopleSoft system contains the processing logic for an integration and determines if the integration is to be processed synchronously or asynchronously. A service operation definition contains the following definitions:
Message. A message contains the payload of the integration.
XML message schema. Message schemas provide the physical description of the data that is being sent, including descriptions of fields, field types, field lengths, and so on.
Handler. A service operation handler contains the processing logic for the service operation.
Routing. A routing definition specifies the direction of the integration (inbound or outbound), routing alias names, transformations, and more.