Go to the Payments section of your dashboard and search for the payment you need to Refund. Select the payment to open Payment Details, in the three dots menu you will see the Refund option. If you see a Void option, see 'how to Void a payment'.
Transactions are eligible for refund 5 days after payment initiation - this delay is to ensure that the original payment settles successfully.
Once the refund is issued, the customer can expect their reimbursement the on the same funding schedule that you receive payments. For example, if your account is set up for 2 day funding (deposit occurs 2 days after payment initiation), refunds will fund your customers on the same 2 day funding schedule.