Online Shop Discount code

What specific challenge or problem does this idea solve?

Having a discount code. Out our studio every year each family receives a $30 uniform voucher per child. It would be good it the parents can use this on the online shop

How should this work?

Set up a code that they can use in their carts to get $30 off, but it must expire after the first purchase

Who will benefit (Admins, Staff, Students)?

Staff as parents won't have to come in and pay at the studio

How will this change impact your daily tasks or overall experience?

Save having a recpeiotinst on as long