added invoiceing

modules/billing/add_service_id_column.sql

@@ -0,0 +1,9 @@
+-- Add missing service_id column to ogp_billing_invoices table
+-- This column is required to track which service/game plan was purchased
+
+ALTER TABLE `ogp_billing_invoices` 
+ADD COLUMN `service_id` INT(11) NOT NULL AFTER `user_id`;
+
+-- Add index for better query performance
+ALTER TABLE `ogp_billing_invoices`
+ADD KEY `service_id` (`service_id`);