Mikros Integration is a plugin for WordPress that allows the integration between WooCommerce coupons 
and Mikros coupons.
Using the plugin you’ll have the possibility to manage coupons details using WooCommerce and sharing 
them with Mikros generation system.
<h3>Usage</h3>
The integration between these two worlds is easy and can be done in 5 steps:
<ol>
<li>Create or edit a coupon on your WooCommerce website</li>
<li>Create the same promotion on https://mikros.coupons/</li>
<li>Once created go to the Data tab of your promotion and copy the Ad Identifier in the bottom</li>
<li>Go back to the coupon settings on WooCommerce and click on the Mikros Integration tab (below Usage Limits)</li>
<li>Paste the Ad Identifier and save</li>
</ol>
Once saved, coupons generated on https://mikros.coupons/ can be used on your ecommerce too and will be confirmed 
once the order is complete (payment included).

Mikros

Mikros Integration for WooCommerce lets you share your promotions through your WooCommerce coupons.

pimwick

PW WooCommerce Copy Coupon adds a Copy link to the default WooCommerce Coupon pages. This makes it possible to duplicate an existing coupon.
<blockquote>
Check out <a href="https://www.pimwick.com/pw-woocommerce-coupons-plus/" rel="nofollow ugc">PW WooCommerce Coupons Plus</a> for even more features:
<ul>
<li>Clip Coupons – Be like Amazon! Require the customer to “clip” the coupon to activate the sale price.</li>
<li>Coupon Bulk Editor – Quickly change multiple coupons.</li>
<li>No Coupons Allowed – Mark a product so that it will never be discounted by a coupon.</li>
<li>And more!</li>
</ul>
</blockquote>

PW WooCommerce Copy Coupon

Does what it says!

You saved me about 10 clicks and 1 minute each for 90 coupons I had to setup. That is worth a 5 star review.

Did what it says it does.
Works out of the box.

Once installed, on the list of all coupons, you'll see a third option when you hover a single coupon, besides Edit and Trash there will be a Copy action.
Once copied, the new coupon will be opened so you can immediately edit the title of the coupon.

I'm a developer and have inspected the code which is neatly organized and I didn't encounter any errors/issues while running the plugin.

Excellent and simple

Simply adds a Copy button to WooCommerce coupons to make it easier to create new coupons!

Mikros vs PW WooCommerce Copy Coupon