Lee Mason

The WP Invoices Ultimate plugin is not an attempt of world domination invoicing system.
The aim is to provide a system which is:
<ul>
<li>Simple</li>
<li>Fast</li>
<li>Easy to configure</li>
<li>Set and forget</li>
</ul>
WPIU Has very few options, which include a little bit about you business, notification email subject customisation, and your paypal information.
WPIU uses Paypal, and manual payments. Right now there is no agenda to add support for other gateways, so if you need multiple gateways please look elsewhere.
WPIU uses the Paypal IPN system and can update the “paid” amounts on each invoice when a user pays for it (part payments can be made).
The Paypal transactions are stored with each invoice and can be accessed both in the admin area, and on the invoice page (all paypal data captured).
Options foreach invoice include:
<ul>
<li>Title</li>
<li>Description</li>
<li>Due Date</li>
<li>Job Number</li>
<li>Invoice Number (randomly generated, can be overidden)</li>
<li>Paid Amount</li>
<li>Client</li>
<li>Send Email / Reminder</li>
<li>Invoice Items (title / qty / unit cost / item total)</li>
</ul>
All invoice items are added up when the invoice is saved (not through javascript for accuracy).
Page template can be overridden by adding a <code>single-wpiu-invoices.php</code> file to the current theme.
Included page template includes and uses the twitter bootstrap css framework http://twitter.github.com/bootstrap/ for simple styling.
Plugin is still in beta right now and has a few limitations:
<ul>
<li>Only global tax rule apply, no per invoice tax percentage – available soon</li>
</ul>
Please see my other plugins / projects / portfolio here http://no-half-pixels.com – always on the lookout for new ventures.

WP Invoices Ultimate

Simple to use invoicing system that can intergrate with Paypal. Very simple, very flexble.

EZ PayPal vs WP Invoices Ultimate