Your balance consists of transactions that are received via the website. The transaction costs are deducted from your balance. Making a refund costs € 0.25.
So it is possible that your balance is insufficient when no new transactions have come in. in this case, there are several options:
- You can wait for the next transaction to come in, and then make the refund;
- You can manually transfer the amount into the customer's account, by logging in to your own bank;
- You can create a payment link and that way make a payment into your account to replenish the balance.