When a client transfers funds or changes their account, use automated confirmation messages to provide information and confirmations. Especially when you are dealing with your own money, you want peace of mind that everything worked. This will also cut down on support requests. As a customer, every change, update or transfer you do, you want proof that you did it, or at least the option to get that proof. As a bank, you are going to have customers of all kinds, so why not use a platform of communication tools that are as flexible as you need it to be.