solvenium

personaldiscount

This plugins enables you create links with a coupon code that will be applied automatically.
If your shop URL is <code>https://shop.example.com</code> then you can add a coupon code in a query parameter like this <code>https://shop.example.com?coupon=WELCOME10</code>.
You can add the coupon code to any URL pointing to a page within yor WooCommerce store. It can be a homepage, product, category, cart, checkout or any other page.
<ul>
<li><code>https:\\shop.example.com\product\invisible-watch?coupon=vip-x4tz8</code></li>
<li><code>https:\\shop.example.com\product-category\new-arrivals?coupon=HELLO-4M1GO</code></li>
<li><code>https:\\shop.example.com\product-category\new-arrivals?coupon=HELLO-4M1GO</code></li>
</ul>
Example use case
A perfect case for Woo Coupon URL is when you want to offer a discount to your newsletter subscribers. 
Normally, you’d append a coupon code to the email, and your customers would need to copy and paste the code. 
With Woo Coupon URL you can now send a link with the discount code that will be applied when your customers click on the link.

Woo Coupon URL

Attach a coupon code to your URL and apply it automatically to the cart.

Aashik P - a11n

By configuring the minimum amount for an order, your manually created coupon will be automatically applied to those customers’s order that meets the minimum requirement specified.

Auto Discount for WooCommerce

Automatically apply coupon when the cart total exceeds the minimum amount defined..

Woo Coupon URL vs Auto Discount for WooCommerce