Модуль после покупки (или доставки) пишет письмо клиенту, с просьбой зайти на сайт и сделать отзыв. За который пользователь получает дисконт на скидку при следующей покупке.

It gives you the possibility to send automated messages to your customers and ask them to review a product they purchased.
User reviews are proven sales drives … and something the majority of customers will to want to see before deciding to make a purchase. User reviews increase conversations. They can eliminate any doubts potential customers may have about a product, or can help with the product selection.
Improving conversations and improving customer experience should be the main purpose of user reviews, but let us not forget the considerable SEO benefits: Fresh, unique content for search engines.
When many e-commerce sites just use standard descriptions, user-generated content can differentiate a product in the search results.

1.5.0, 1.5.0.1, 1.5.0.2, 1.5.0.3, 1.5.0.4, 1.5.0.5, 1.5.1, 1.5.1.1, 1.5.1.2, 1.5.1.3, 1.5.2, 1.5.2.1, 1.5.3, 1.5.3.1, 1.5.4, 1.5.4.1, 1.5.5.1, 1.5.6, 1.5.6.1, 1.5.6.2, 1.5.6.3, 1.5.6.4, 2.0.0.0, 2.0.1.0, 2.0.1.1, 2.0.2.0, 2.0.3.1, 2.1.0.1