The Todos App is a free service offered by Payburner to demonstrate what we call a XAPP (XRP Application). A XAPP is a web-based service that leverages the features of the Payburner platform including instant login with self-sovereign identity and instant payments using the XRP ledger. Anybody, including you, can create and publish a XAPP to payburner. The instructions and source code are available at payburner-service-todos at github.
This XAPP is published by: