The user ID or principal name (email) of the user whose message to retrieve. Required when using app-only (S2S) authentication. If not provided, defaults to '/me' endpoint for delegated authentication.
message_idstring
Required
The unique identifier of the message whose MIME content to retrieve. Must be obtained from message listing or query operations.
Observable output
data
Required
Data from the action execution
errorstring
Error if any occurred during the execution of the action
successfulboolean
Required
Whether or not the action execution was successful or not