itthinx

This plugin integrates <a href="http://www.itthinx.com/plugins/affiliates/" rel="nofollow ugc">Affiliates</a> with <a href="http://www.ecwid.com/" rel="nofollow ugc">Ecwid</a>.
With this integration plugin, affiliates are credited with referrals automatically after a customer has made a purchase through the online store powered by Ecwid.
The plugin allows you to set a referral (commission) rate so that your affiliates get credited with a referral based on a percentage of each sale’s total net amount.
Required:
<ul>
<li>An <a href="http://www.ecwid.com/" rel="nofollow ugc">Ecwid</a> account with Order API and Instant Order Notifications API access enabled – this will not work with free accounts.</li>
<li><a href="https://wordpress.org/extend/plugins/affiliates" rel="ugc">Affiliates</a></li>
<li><a href="https://wordpress.org/extend/plugins/affiliates-ecwid-light" rel="ugc">Affiliates Ecwid Integration Light</a> (this plugin)</li>
</ul>
Optional:
<ul>
<li>The <a href="https://wordpress.org/extend/plugins/ecwid-shopping-cart/" rel="ugc">Ecwid Shopping Cart</a> plugin for WordPress</li>
</ul>
Install these, set up your shop, decide how much you want to pay your affiliates and start selling!
Feedback is welcome! 
If you need help, have problems, want to leave feedback or want to provide constructive criticism, you can leave a comment here <a href="http://www.itthinx.com/plugins/affiliates-ecwid-light" rel="nofollow ugc">Affiliates Ecwid Light plugin page</a>.
Please try to solve problems there before you rate this plugin or say it doesn’t work. There goes a lot of work into providing you with free quality plugins! Please appreciate that and help with your feedback. Thanks!
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Affiliates Ecwid Light

This plugin integrates Affiliates with Ecwid.

Sumesh S

Plugin options :
<ol>
<li>Individual referral rates can be added to individual affiliates by the wordpress admin.</li>
<li>Easily manage the refferal rates for affiliates and the admin can easily change the rates at any moment.</li>
</ol>
Requirements :
<ul>
<li>WordPress( 4.0 or greater )</li>
<li><a href="https://wordpress.org/plugins/woocommerce/" title="WooCommerce" rel="ugc">WooCommerce</a></li>
<li><a href="https://wordpress.org/plugins/affiliates" title="Affiliates Plugin By itthinx" rel="ugc">Affiliates Plugin</a></li>
</ul>

Affiliates Referral for WC

This Plugin Helps you add referral rates to individual affiliates integrating with woocommerce product purchase.

Affiliates Ecwid Light vs Affiliates Referral for WC