For this WordPress-based car rental website, a custom plugin was created to implement a coupon system, enhancing the rental experience. The plugin featured a backend dashboard for admins to generate and manage coupons, similar to WooCommerce Coupons. The rental process was modified to apply discounts based on coupon usage, and a data table was built to store reservation details along with applied coupons.

Additionally, a referral feature was introduced at checkout, allowing users to send exclusive discount coupons via email to referred individuals for their next rental.