[we4sz]

Three fields in the Events API payload that Slack sends with events have no property in SlackNet 0.19.0. Unlike the fields inside an event, they have nowhere to land: EventCallback and Authorization have no extension data, so a deserialized callback silently drops them. I found them comparing a real Events API delivery with EventCallback. My app doesn't read them through a workaround today. This models them. It is one commit.

1. EventCallback.ContextTeamId (context_team_id) and ContextEnterpriseId (context_enterprise_id), next to TeamId and EnterpriseId. The reference describes the second as "The enterprise org through which your app is receiving the event (i.e., where the app is installed).", and ContextTeamId has the workspace version of that sentence.
2. Authorization.IsEnterpriseInstall (is_enterprise_install), on each entry of authorizations. oauth.v2.access has the same flag, and its page says to look for it "to determine whether it has been installed on an entire organization or a single workspace", which is the wording I used.

Compatibility

Additive only. The new properties default to null and false.

Testing

New EventCallbackTests: a callback with both context IDs, one with a null context_enterprise_id, and authorizations with is_enterprise_install true and false. ./do test passes (786 tests).

Seen in a real response: all three are in a real Events API delivery.

Not verified: the wording. The reference describes context_enterprise_id in its field table, but shows context_team_id and is_enterprise_install only in its example payloads, so those two doc comments are my reading of them. I also haven't run my app against a local pack of this branch.