diff --git a/lib/decentralised_book_index/sync/sync_tasks/sync_books_task.ex b/lib/decentralised_book_index/sync/sync_tasks/sync_books_task.ex
index 43ffda9..86a30df 100644
--- a/lib/decentralised_book_index/sync/sync_tasks/sync_books_task.ex
+++ b/lib/decentralised_book_index/sync/sync_tasks/sync_books_task.ex
@@ -1,6 +1,8 @@
 defmodule DecentralisedBookIndex.SyncTasks.SyncBooksTask do
+  alias DecentralisedBookIndex.Sync.ApiClients.FetchJson
   alias DecentralisedBookIndex.Sync.ApiClients.FetchJsons
   alias DecentralisedBookIndex.Sync.DataTransformers.BookTransformer
+  alias DecentralisedBookIndex.Sync.DataTransformers.BidsTransformer
   alias DecentralisedBookIndex.Sync.BookSync
 
   alias DecentralisedBookIndex.Metadata.DBIServer
@@ -17,6 +19,9 @@ defmodule DecentralisedBookIndex.SyncTasks.SyncBooksTask do
   def sync_author_chunk(json_chunk, server_id) do
     for json <- json_chunk do
       with {:ok, attrs} <- BookTransformer.from_json(json),
+           {:ok, author_roles} <- get_author_roles(json),
+           {:ok, bids} <- get_bids(json),
+           attrs <- merge_relationships_attrs(attrs, bids, author_roles),
            :ok <- BookSync.create_update(attrs, server_id) do
         :ok
       else
@@ -33,4 +38,46 @@ defmodule DecentralisedBookIndex.SyncTasks.SyncBooksTask do
       sync_author_chunk(json_chunk, server.id)
     end
   end
+
+  defp merge_relationships_attrs(attrs, bids, author_roles) do
+    attrs
+    |> Map.put(:bids, bids)
+    |> Map.put(:author_roles, author_roles)
+  end
+
+  defp get_author_roles_url(json) do
+    url = get_in(json, ["relationships", "author_roles", "links", "related"])
+  end
+
+  defp get_author_roles(json) do
+    url = get_author_roles_url(json)
+
+    with {:ok, json} <- FetchJson.get(url),
+         {:ok, roles} <- BidsTransformer.from_json(json) do
+      {:ok, roles}
+    else
+      {:error, reason} ->
+        Logger.error("Pipeline error: #{inspect(reason)}")
+
+        {:error, reason}
+    end
+  end
+
+  defp get_bids_url(json) do
+    url = get_in(json, ["relationships", "bids", "links", "related"])
+  end
+
+  defp get_bids(json) do
+    url = json |> get_bids_url()
+
+    with {:ok, json} <- FetchJson.get(url),
+         {:ok, bids} <- BidsTransformer.from_json(json) do
+      {:ok, bids}
+    else
+      {:error, reason} ->
+        Logger.error("Pipeline error: #{inspect(reason)}")
+
+        {:error, reason}
+    end
+  end
 end