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.

gr8nilay

This plugin create a custom post type for coupon code that includes Coupon Start / End date, Discount in Percentage / Cash. The coupons are listed with all details so you can easily manage it from listing page. You can easily use this plugin by customization by your own to enable coupon feature to your site.
How to Use: 
This is custom post type so you can apply all the hooks / customization that you do with any custom post type. Below are the variables which are used to store values of coupons so you just need to use meta values for the same.
Coupon Code = np_ccode__ccode 
Discount In ( % or $ ) = np_ccode__discount_in 
Discount Amount/Percent = np_ccode__amt_per 
Coupon Start Date = np_ccode__ccstart_date 
Coupon End Date = np_ccode__ccstart_date
You can use above meta keys into your site by your own to customize your site coupon feature.

Easy Coupon Code WP

Nice..!!

Provides you the custom post type with ready meta fields to enable coupon module to your site.

Mikros vs Easy Coupon Code WP