You can issue a refund for a membership up until two days after the money has been withdrawn. Go to the player profile, press on the pen and paper symbol, press on the little arrow next to "remove" an choose refund option.
We are able to give refunds until the last date of the current month. For example, refunds can be given by MATCHi until last day of April for reservations in April. Later you need to handle the refund manually since the invoice has already been created and the amount has been transferred to your venue.