Protocol for serializing content items in Deep Linking responses.

Ltix implements this protocol for the five standard content item types and for plain maps (as an escape hatch for one-off custom types). Implement this protocol on your own struct when you need a reusable custom content item type:

defmodule MyApp.ProctoredExam do
  defstruct [:url, :title, :duration_minutes]

  defimpl Ltix.DeepLinking.ContentItem do
    def item_type(_item), do: "https://myapp.example.com/proctored_exam"

    def to_json(item) do
      %{
        "type" => "https://myapp.example.com/proctored_exam",
        "url" => item.url,
        "title" => item.title,
        "https://myapp.example.com/duration" => item.duration_minutes
      }
    end
  end
end

The platform's accept_types must include your custom type string.