July 9, 2019
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Our API directory now includes 35 invoicing APIs. The newest is the CashFlows API. The most popular, in terms of mashups, is the PayPal API. We list 33 PayPal mashups. Below you'll find some more stats from the directory, including the entire list of invoicing APIs.
Billing clients and managing invoices and payments is time consuming and probably not the most enjoyable part of running a business. Pancake is a self-hosted online business suite that makes the whole process a lot easier. This application allows users to invoice clients online, manage projects from proposal to completion and more. Pancake provides the Pancake API that allows users to access this functionality through HTML.