Is it possible to post to chat.postMessage as any user in a Slack team?
I'm building a Slack integration that is intended to modify some text and then post it to a Slack channel as though the user who triggered the command had said it. e.g. /makeFace disapproval @Ben 3:45pm ಠ_ಠ I ask for the client permission scope, which adds the chat:write:user permission. But when I hit the chat.postMessage endpoint, it only seems to allow you to post as the user who added the integration because the token it returns seems to be individuated for that user. I know that giphy, for instance, sends its gif messages as though you are the originator, but I can't find out how they