Method to fetch a single notification

app/controllers/api/v1/notifications_controller.rb

@@ -20,4 +20,8 @@ class Api::V1::NotificationsController < ApiController
 
     set_pagination_headers(next_path, prev_path)
   end
+
+  def show
+    @notification = Notification.where(account: current_account).find(params[:id])
+  end
 end

config/routes.rb

@@ -114,7 +114,7 @@ Rails.application.routes.draw do
         end
       end
 
-      resources :notifications, only: [:index]
+      resources :notifications, only: [:index, :show]
       resources :favourites,    only: [:index]
 
       resources :accounts, only: [:show] do