Platform profiles.

A platform identifies itself with UCP-Agent: profile="<url>". That URL serves the platform's profile document, whose order capability carries the webhook_url order events go to. Bazaar.Plugs.UCPHeaders puts the URL in conn.assigns.ucp_agent_profile.

HTTP client

No HTTP client is bundled. Pass a function that GETs a URL and returns {:ok, %{status: integer, body: binary | map}} or {:error, reason}:

http_client = fn url ->
  case Req.get(url) do
    {:ok, %{status: status, body: body}} -> {:ok, %{status: status, body: body}}
    {:error, reason} -> {:error, reason}
  end
end

{:ok, webhook_url} = Bazaar.Platform.webhook_url(profile_url, http_client: http_client)

Caching

discover_cached/3 takes a cache map with get (returns {:ok, value} or :miss) and put functions, so a profile is fetched once per platform.