Karny is a free digital credit book that helps you manage your business and your credit and debit transactions with your customers and suppliers. Safe and secure, Karny application allows you to track all of your transactions (credit or debit) with a third party and to record them securely. You can also remind your customers and suppliers of their situation by sending them reminders via WhatsApp. Never forget any transaction again and never lose your credit books/accounts again thanks to Karny.