All the providers restrict types of currency exchanges, but there are slight differences in what kind of exchanges they mean.
SumUp restricts currency exchanges, virtual currency services, money transfers and forex, while iZettle restricts businesses relating to virtual currency “which can be converted/exchanged to real money”. Square prohibits wire transfer money orders and sales of foreign currency by non-financial institutions. PayPal prohibits businesses involving currency exchanges, and requires preapproval if you’re involved in forex.
Prepaid cards, vouchers, money orders and cheques
Similar to the “future business” restriction, the payment providers typically don’t accept businesses dealing with prepaid currency of any type. That said, shop vouchers and gift cards you create for customers could be accepted, so do ask the providers if you’re unsure.
Specifically: SumUp restricts prepaid services. iZettle restricts vouchers with a longer duration than 36 months. Square restricts sales of money orders, prepaid cards and cheques. PayPal requires preapproval for selling stored-value cards, and prohibits businesses associated with selling traveller’s cheques or money orders, and cheque-cashing businesses.
Debt-, credit- and loans-related
SumUp restricts “collection agencies, refinancing of debt/factoring, mortgage, brokers/reduction services/refinancing, payday loans” and “pawn shops (merchants that lend money in exchange for personal property such as jewellery etc.)”. Square restricts credit counselling, credit repair agencies, bankruptcy lawyers or collection agencies engaged in the collection of debt.
PayPal restricts “transactions to finance or refinance debts funded by a credit card”, layaway systems, and businesses involving certain credit repair, debt settlement services and credit transactions.