You can proceed a payment for a commission to a partner who attracted new customers to your account. All payments are performed without GetCourse participation, i.e. all calculations with partners you carry out on your own in any convenient way (for example, with usage of bank transfer).
You cannot make a refund from GetCourse. You can make a refund from the payment system where the payment was made, and in GetCourse, change the payment status to “Refunded”, and the order status to “Canceled”, “False” or “Pending refund”. Don't forget to click “Save”.