How I used a custom permission evaluator in Spring?

On a Friday evening, a customer writes in. He says one of his employees, a Fleet manager, is not able to invite a Driver to use our electric charging portal. This is not something you want to hear on a Friday evening before signing off for the weekend. It is also not something you want to leave for Monday morning. A driver who’s not able to use our portal to charge his EV for a weekend trip to the Alps doesn’t send the right signal.

The team took it upon themselves to investigate what could potentially be wrong. This was something that had…