A Process Service Consumer is a participant Web service that is used in building a receive and/or reply activity. It consists of a name and an interface.
You can create a service consumer in stages:
Enter a name or accept the default name, Process_Consumer.
If interface resources are available, you can define the interface. If they are not, you can add them later, in the Properties view.
By completing the participant details, you are essentially creating all the required elements needed for a process' receive and reply activities.