If an Intermdiary is redistributing a notification using $process-message, what does that look like? For example, is the intermediary supposed to modify MessageHeader.sender, .source, .receiver, and .destination? Or, is the existing bundle supposed to be wrapped into another bundle (e.g., new notitification bundle and the contents are the received bundle)?

Existing Wording:

Not shown in figure 4, after the Intermediary successfully receives the notification, processes it and optionally searches and process the search results, it redistributes the data the end users. It MAY use FHIR messaging and the $process-message operation to do this or some other messaging protocol such as Direct, SMS or V2 messaging. Note that the Notification Intermediary MAY customize the content based on the end user (for example, withholding data that a particular care team member does not need).