Authorize Slack

A personal connect (access_mode=user) creates an installation every time, so one person can hold several, each feeding its own store with its own selection, e.g. public channels in one store and direct and group messages in another; the same person in another organization is that organization's own. A workspace has one bot, so a bot connect refreshes the workspace's bot installation when the organization has one. To refresh an existing installation's tokens, reconnect it through GET /v1/integrations/slack/installations/{installation_id}/oauth/authorize instead.

After consent the browser returns to the organization's return URL with status, installation_id or error, and reference. error is store_in_use when another installation of the person already feeds the store, store_exists when new_store names a store that exists by then, new_store_on_refresh when new_store is set on a workspace bot's refresh, store_change_on_refresh when store_name names another store than the refreshed bot's, workspace_already_connected when another organization installed the workspace's bot, and otherwise the provider's error (such as access_denied), invalid_state or callback_failed.