Simple to use invoicing system that can intergrate with Paypal. Very simple, very flexble.
As of April 2026, WP Invoices Ultimate is a WordPress money plugin with 10 active installations and a 4/5 rating from 1 reviews. It has been downloaded 10K+ times in total. Requires WordPress 3.3+ and PHP false+. Available on WordPress.org since 2011. Last updated 14 years ago — may have compatibility concerns. Top alternative: Open Currency Converter.
The WP Invoices Ultimate plugin is not an attempt of world domination invoicing system.
The aim is to provide a system which is:
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…
| WordPress | 3.3+ requiredTested up to 3.3.2 |
| PHP | false+ required |
Plugin data sourced from WordPress.org. Analysis and metrics by PluginSift.