Additional Reading:
https://www.flickr.com/photos/146075851@N05/36813191414
http://andrewshort.postbit.com/what-is-commission-code.html
http://www.23hq.com/nolan123/photo/36244225
http://marketingproducts.over-blog.com/2017/10/commission-code.html
https://netmarketinga.wordpress.com/2017/10/06/what-is-commission-code/