Goth.HTTPClient.request

You're seeing just the callback request, go back to Goth.HTTPClient module for more information.
Link to this callback

request(method, url, list, body, opts, initial_state)

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Specs

request(method(), url(), [header()], body(), opts :: keyword(), initial_state()) ::
  {:ok, %{status: status(), headers: [header()], body: body()}}
  | {:error, Exception.t()}

Callback to make an HTTP request.