There are a few available on our GitHub as Alpha Proof of Concept scripts. There will be more to come as well.

Wordpress plugin (working but we will be making some changes and fixing compatibility issues with certain themes)
https://github.com/DNotesCoin/dnotespay-wp-digital-poc

PHP / Javascript DNotes Pay script compatible with just about any website.
https://github.com/DNotesCoin/dnotespay-digital-poc
Live demonstration of purchasing the four pillars book: https://fourpillarsofbusinesssuccess.com/DNotesPay/
Video: https://www.youtube.com/watch?v=4tLDY3RPSbc
Configuring the script: https://www.youtube.com/watch?v=4tLDY3RPSbc&t=295s

Software version of DNotes Pay in C#
https://github.com/DNotesCoin/dnotespay-sw-poc
Working on a program to demonstrate the capabilities before releasing.