Akeda Bagus

This plugin is an extension to <a href="https://wordpress.org/plugins/slack" rel="ugc">Slack plugin</a> that allows you to send notifications to Slack channels whenever payment in WooCommerce is marked as complete.
The new event will be shown on integration setting with text When a payment in WooCommerce is marked as complete. If checked then notification will be delivered once payment is marked as complete.
You can alter the message with <code>slack_woocommerce_order_status_completed_message</code> filter. The filter receives following parameters (ordered by position):
<ul>
<li><code>$message</code> — Default string of message to be delivered</li>
<li><code>$order</code> — Order object</li>
</ul>
Development of this plugin is done on <a href="https://github.com/gedex/wp-slack-woocommerce" rel="nofollow ugc">GitHub</a>. Pull requests are always welcome.

Slack WooCommerce

Send notifications to Slack channels whenever payment in WooCommerce is marked as complete.

Dor Zuberi

Light and customisable WordPress plugin to integrate your site with Slack.
Choose what type of notification you would like to receive: 
* WordPress Update Available 
* Plugins Updates Available 
* Administrator Login 
* Failed Administrator Login 
* New User Registration 
* New Comments 
* Nee WooCommerce Orders 
* WooCommerce Product with Low Stock 
* And much more!
You can contribute by simple <a href="https://github.com/dorzki/Slack-Notifications" rel="nofollow ugc">Forking me on GitHub</a>.

Slack Notifications by dorzki

Thank you for this amazing plugin! Works great.

Excellent Plugin!

Get WordPress notifications to your team's Slack channel.

Slack WooCommerce vs Slack Notifications by dorzki