You can use either Peoplesoft (Oracle EnterpriseOne (E1) wM Adapter) or communicate via http posting XML (pub.client:http) built-in service and mapping etc…will be done using the webMethods Developer and buidl the flow/adapter services/notifications that listens to backend system and generate XML and transmit via http.
In your above statements you are asking about webservices…do the target system is requesting webservices(SOAP/http)??
Pls review the webMethods tutorials in the Advatage.webmethods.com components specific to IntegrationServer,built-in services,peoplesoft Adapter(if you choose),webservices,developer,trading networks (depends on your architecture), etc.
HTH,
RMG
#Integration-Server-and-ESB#webMethods#webMethods-General