An SaaS partner can use this operation to list details about a partner event source that they have created.
cloudwatchevents_describe_partner_event_source(Name)
[required] The name of the event source to display.
svc$describe_partner_event_source( Name = "string" )
AWS customers do not use this operation. Instead, AWS customers can use DescribeEventSource to see details about a partner event source that is shared with them.