Do your customers want to pay with cash? Then you need to have change available. But what about customers who only want to pay by card? For that, you need a provider – and can they also handle credit cards? Of course, that service will cost you extra.
Do you offer installment payments for big buyers?
A delivery service?
Can your customers withdraw cash at the checkout?
All of these services would further increase the depth of gameplay and would be a great addition.