Other - This tab has a few general but important options for the account. The Account Customer tickbox (when ticked) allows the account to track balances, get charged, and receive payment at later dates.
It also has a tickbox for Loyalty program, a box to assign Discount Voucher category, and behaviours on enabling or disabling printing/emailing of receipts or invoices.
There is also a surcharge setting that is used when running a customer's account (if you wish to charge a specific customer a surcharge).
Note: This surcharge doesn't appear when forward charging for payments and it only appears during the Customer Billing process for a given date range.