MessageCenterAction
Starts an activity to display either the Inbox or a Message using either showMessageCenter ()} or showMessageCenter.
Accepted situations: SITUATION_PUSH_OPENED, SITUATION_WEB_VIEW_INVOCATION, SITUATION_MANUAL_INVOCATION, SITUATION_AUTOMATION, and SITUATION_FOREGROUND_NOTIFICATION_ACTION_BUTTON.
Accepted argument values: null
to launch the inbox, the specified message ID, or "auto"
to look for the message ID in the getMetadata.
Result value: null
Default Registration Names: ^mc, open_mc_action