YITH WooCommerce Advanced Reviews is the all-in-one plugin for getting positive product reviews, building your e-commerce reputation, and using social proof to drive sales.
The integration of these two plugins allows adding credit to customers’ wallet automatically when reviewing a product. The option is available when using the Review for Discounts module.
When creating the coupon in Review for discounts > Coupon, you can select Add funds in Coupon settings > Discount type and enter the amount in the related field.
For further details about YITH Advanced Reviews settings, please refer to the official documentation.