Note for my future self since I always need to look this up: Here are the formats for tagging users in Slack when you post messages webhooks or the API:
- User:
<@userid>, such as<@UUBE7MDML>. You can find this user ID in the web interface of Slack and going to their profile, then looking at the URL, which is in the format https://app.slack.com/client/clientID/something/rimeto_profile/userID - Group:
<!subteam^subteamID|@group-name>, such as<!subteam^S0406RGH26B|@chucks-fake-team>– You can find that in the web app, too: https://app.slack.com/client/clientID/browse-user-groups/user_groups/subteamID

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