backend returns if user is already subscribed

app/controllers/products_controller.rb

@@ -38,8 +38,16 @@ module DiscoursePatrons
       {
         id: product[:id],
         name: product[:name],
-        description: product[:metadata][:description]
+        description: product[:metadata][:description],
+        subscribed: current_user_products.include?(product[:id])
       }
     end
+
+    def current_user_products
+      ::DiscoursePatrons::Customer
+        .select(:product_id)
+        .where(user_id: current_user.id)
+        .map { |c| c.product_id }.compact
+    end
   end
 end

app/controllers/subscriptions_controller.rb

@@ -40,9 +40,11 @@ module DiscoursePatrons
           group.add(current_user)
         end
 
-        unless DiscoursePatrons::Customer.exists?(user_id: current_user.id)
-          DiscoursePatrons::Customer.create(user_id: current_user.id, customer_id: params[:customer])
-        end
+        DiscoursePatrons::Customer.create(
+          user_id: current_user.id,
+          customer_id: params[:customer],
+          product_id: plan[:product]
+        )
 
         render_json_dump @subscription