https://va.inpost24.ca/locker2locker is a small PHP application that was built as a WordPress plugin to accompany another application I built for InPost. This small application allows a user to select two different InPost lockers somewhere in Ontario as the source and destination of their package.
Once payment is received, the application communicates with a number of internal InPost APIs and generates a printable shipping label that is emailed to the user. The package is also registered in the InPost database internally.
This plugin is also built on the LAMP stack and was integrated with WordPress after its initial build.