The Prestashop plugin for forma.lms allows you to sell courses directly on your Prestashop e-commerce. You just need to create new course in forma.lms and use the same id on Prestashop. Once a user will buy it he will use the same e-com credentials to login in forma.lms, founding the course just purchased. Also the Prestashop plugin disable for the user the possibility to change his login credentials in forma.lms to keep the same login between forma.lms and Prestashop.
Login to your forma.lms platform
Configure the course you want to sell
Login to Prestashop
Configure the Prestashop 2 forma.lms module
Create a new product just adding forma.lms course id and the user will find it on his platform once purchase is completed.