There's a reason Sprout Invoices is the best rated invoicing plugin for WordPress - it's the most fully featured Invoicing solution for WordPress with the highest regarded support available.
The goal of InfyCRM is to manage & digitize the relationship of your customers with your business. InfyCRM is a perfect solution to manage your Customers, Contracts, Projects, Products, Leads, Invoices, and much more.
This extension will automatically attach a PDF copy of your invoice to your completed order email. Customers can sign in to their account and upload previous invoices, while administrators can resubmit the PDF or download a copy.