Unique notification emails

CallenACP

Is there any possible way to have someone book an item and then be emailed a unique code that can only be used once a day?

For example we have a car park that can be paid for online they then must call the office to be provided with a one time use code that they use at an exit machine.

Is there a way to automate this? The codes can be used once a day and reset at midnight each night.

Thanks for any advice!