FIX: Properly namespace payment serializer (#15)

app/serializers/discourse_subscriptions/payment_serializer.rb

@@ -1,53 +1,55 @@
 # frozen_string_literal: true
 
-class PaymentSerializer < ApplicationSerializer
-  attributes  :payment_intent_id,
-              :receipt_email,
-              :url,
-              :created_at_age,
-              :amount,
-              :amount_currency,
-              :username,
-              :user_id
+module DiscourseSubscriptions
+  class PaymentSerializer < ApplicationSerializer
+    attributes  :payment_intent_id,
+                :receipt_email,
+                :url,
+                :created_at_age,
+                :amount,
+                :amount_currency,
+                :username,
+                :user_id
 
-  def created_at_age
-    Time.now - object.created_at
-  end
-
-  def amount_currency
-    ActiveSupport::NumberHelper.number_to_currency(
-      object.amount / 100,
-      precision: 2,
-      unit: currency_unit
-    )
-  end
-
-  def username
-    user&.username
-  end
-
-  private
-
-  def user
-    begin
-      User.find(object.user_id)
-    rescue
-      nil
+    def created_at_age
+      Time.now - object.created_at
     end
-  end
 
-  def currency_unit
-    case object.currency
-    when "eur"
-      "€"
-    when "gbp"
-      "£"
-    when "inr"
-      "₹"
-    when "brl"
-      "R$"
-    else
-      "$"
+    def amount_currency
+      ActiveSupport::NumberHelper.number_to_currency(
+        object.amount / 100,
+        precision: 2,
+        unit: currency_unit
+      )
+    end
+
+    def username
+      user&.username
+    end
+
+    private
+
+    def user
+      begin
+        User.find(object.user_id)
+      rescue
+        nil
+      end
+    end
+
+    def currency_unit
+      case object.currency
+      when "eur"
+        "€"
+      when "gbp"
+        "£"
+      when "inr"
+        "₹"
+      when "brl"
+        "R$"
+      else
+        "$"
+      end
     end
   end
 end