YITH Review for Discounts allows you to send email notifications to your customers and invite them to review the products they purchased in exchange of a coupon code.
When combined with YITH Multi Vendor, also your vendors will be able to customize the emails sent to offer a coupon on their own products.
To enable this integration, activate both plugins, go to YITH > Multi Vendor > Vendors > Vendors Permissions and select Create and manage discounts for their customers in the option Regarding his/her store, a vendor can.
Now the vendor will be able to see a Review for discounts menu and customize the content of these emails.
For more details about how to use YITH WooCommerce Review for Discounts plugin, please, refer to the plugin documentation.