Other income
Use Receive money for money that isn't a sale to a customer: bank interest, rent you receive, commission, a grant, a refund from a supplier.
Choose the account it went into, who it came from, and the income account for each line (blank uses Other income). If VAT was charged (for example on commercial rent), choose the rate.
Payments from customers for invoices belong in Sales > Payments, and sales paid on the spot in Cash sales.