defmodule MyApp.JetstreamLogger do
  use JetstreamLibrary,
    kinds: [] # all,
    collections: [] # all

  require Logger

  def get_cursor, do: nil
  def put_cursor(_seq), do: :ok

  def handle_event(payload), do: Logger.info(inspect(payload))
end

# add it to your application.ex

  @impl true
  def start(_type, _args) do
    children = [
      MyApp.JetstreamLogger,
      MyAppWeb.MetricsEndpoint
    ]

    # See https://hexdocs.pm/elixir/Supervisor.html
    # for other strategies and supported options
    opts = [strategy: :one_for_one, name: Shelf.Supervisor]
    Supervisor.start_link(children, opts)
  end