ggfat

This plugin automatically offers a discount coupon for every purchase made by setting a expiration date in days. 
This plugin manages to automatically give customers a coupon for each purchase they do so as to entice them to make the next purchase. You can set the discount percentage, the days of validity, the description of the coupon and you can send everything via email. Then you can enter the subject and body of the email.
Truly wonderful.

WC Give a Coupon

Grazie a questo plugin sono riuscito a dare automaticamente ai miei clienti un coupon per ogni acquisto che facevano così da invogliarli a fare il prossimo acquisto.

Wonderful

A plugin that automatically offers a discount coupon for every purchase made by setting a deadline.

Automattic

WooCommerce

SomewhereWarm

Manos (a11n)

Chris Lilitsas (a11n)

Free add-on for the official <a href="https://woocommerce.com/products/gift-cards/" rel="nofollow ugc">WooCommerce Gift Cards</a> extension that allows you to use the default coupon form to apply and redeem gift cards.
After activating the plugin, the “Have a Gift Card?” form will be hidden, and customers will be able to apply gift card codes using the coupon input field.
Note: This plugin has been created to validate and refine a feature that may be rolled into WooCommerce Gift Cards — or dropped! — in the future.
Important: This plugin is not compatible with the Cart and Checkout Blocks.
Important: The code in this plugin is provided “as is”. Support via the WordPress.org forum is provided on a voluntary basis only. If you have an active subscription for WooCommerce Gift Cards, please be aware that WooCommerce Support may not be able to assist you with this experimental plugin.

Gift Cards – Coupon Input

Free mini-extension for WooCommerce Gift Cards that allows you to use the default coupon form to apply and redeem gift cards.

WC Give a Coupon vs Gift Cards – Coupon Input