SlackNotification.post

You're seeing just the function post, go back to SlackNotification module for more information.
Link to this function

post(client, url, body, opts)

Specs

Perform a POST request.

See request/1 or request/2 for options definition.

post("/users", %{name: "Jon"})
post("/users", %{name: "Jon"}, query: [scope: "admin"])
post(client, "/users", %{name: "Jon"})
post(client, "/users", %{name: "Jon"}, query: [scope: "admin"])