Akshar Soft Solutions

<p>This plugin allow admin to add notice to order for particular customer which will display on all order of that customer.</p>
<p><strong>Usage</strong></p>
<p><em>Basic usage</em></p>
<p>Once you have install and activate plugin it will allow admin to add notice on edit order page. Notice will display on order listing page with red highlight and on edit order page.</p>
<h3>Requirements</h3>
<ul>
<li>PHP 5.3 or higher</li>
</ul>
<h3>Translations</h3>
<ul>
<li>None</li>
</ul>


AS Blacklist Customer

Adds a blacklist notice to customers, shown on all past and future orders in admin.

jamiewilson

<p>Gatekeeper allows administrators to take a WordPress site offline quickly and easily while leaving it fully accessible to administrators and other authorized users. Site visitors will be shown or redirected to a specified offline page. An optional blacklist can be used for permanent bans.</p>
<p>** Features **</p>
<ul>
<li>Visitors can either be redirected to an existing non-WordPress offline page (using http 302 temporary redirect) or WordPress pages can be temporarily replaced with the offline page.</li>
<li>Logged in admins can be whitelisted</li>
<li>The current admin’s IP address can be automatically whitelisted</li>
<li>An IP-based whitelist that can accept specific IP addresses, wildcards, and ranges</li>
<li>A basic IP-based blacklist that redirects blacklisted IPs to a specified page (not to be used for security)</li>
<li>A notifier that appears on administrator pages when the site is offline</li>
</ul>


Gatekeeper

Gatekeeper allows administrators to take a WordPress site offline while leaving it accessible to authorized users for maintenance, testing, etc.

AS Blacklist Customer vs Gatekeeper