Licensing for Requisition Management Workflow 2.0 (GP 2013 R2)

Hello:

The blog from the URL, below, says that you do not have to be a licensed GP user to approve requisitions through e-mail via GP Web Services for GP 2013 R2.

Does that mean that the only licensing that is required is for the user that enters the requisitions but not for the user that approves them?

http://www.erpsoftwareblog.com/2015/02/microsoft-dynamics-gp-workflow-2-0-configuration-tutorial/

Thanks!

John