Laravel Website Development & Bug Fixing

I have a website written in Laravel. The website is custom written and sells a single product, at a single price. The product gives the customer access to log into a back-end panel for 30 days.

The project is to add promotional code functionality, which allows the shop owner to generate promotional codes for distribution. The promotional codes allow the product to be purchased for a different (lower) price, or extends the login time, and can be single use or multiple use. You must be able to program using proper Laravel technique and best practices. The code will be checked.