add auditing for qrpay gateway

db/migrate/20250609101022_payment_gateway_audits.rb

@@ -0,0 +1,17 @@
+class PaymentGatewayAudits < ActiveRecord::Migration[5.1]
+  def change
+    create_table :payment_gateway_audits do |t|
+      t.string :receipt_no
+      t.string :payment_gateway_name
+      t.string :request_method
+      t.string :event_type
+      t.string :endpoint_url
+      t.json :request_body
+      t.json :response_body
+
+      t.timestamps
+
+      t.string :shop_code
+    end
+  end
+end