WooCommerce - URL Coupons v2.6.0

Add a unique URL to a coupon code that automatically applies a discount and (optionally) adds products to the customer's shopping cart. Extend or Automate your Coupons with WooCommerce URL Coupons. The URL Coupons extension allows you to add a unique URL to any coupon in your WooCommerce store. When this URL is used or clicked on, it automatically applies the coupon discount and can (optionally) add products to the customer's shopping cart.

DEMO:
https://woocommerce.com/products/url-coupons/