I'm building somewhat integration github with slack, which will notify users (reviewers of pull request) and send them link in #general chat.
And I'm struggling with mentioning users, right now I found only one way to mention them: via username in Slack, however to know this username, I must ask person to give it to me. Mentioning via <@display_name> doesn't seem to work, even with link_names: 1 parameter.