The bank trains you how to use all the technology. New customers come to make loan repayments--and they buy vegetables while they're there! But now you must hold a lot of cash money. You and your uncle feel nervous about theft.
What should you do?
There is a courier service that collects and delivers cash. The fees will reduce your profits, but also reduce your risks. You sign up.
You don't want to pay for a courier service. You buy a heavy metal box with a lock to secure your customers' loan repayments.