In the Balance section of your dashboard, find the payment intent you want to refund. You can use the filter to select the date of the payment.
Click on the payment to open the payment details.
Click on the Issue refund button, you will be prompted to enter the amount to refund on the customer's card.
You can refund any amount, up to the total payment amount. Note that this will come out of your balance.
Click on the Issue refund button to confirm the refund. The refund will now appear on the Balance section of your dashboard.