In the previous chapter, you learned how to integrate a payment gateway into your shop. You also learned how to generate CSV and PDF files. In this chapter, you will add a coupon system to your shop. You will learn how internationalization and localization work, and you will build a recommendation engine.

This chapter will cover the following points:

• Creating a coupon system to apply discounts
• Adding internationalization to your project
• Using Rosetta to manage translations
• Translating models using django-parler
• Building a product recommendation engine