Changes to Get Referral Stats

added the optional property cash_out_available_now to the response with the 200 status

added the optional property commission_all_released_at to the response with the 200 status

added the optional property commission_hold_days to the response with the 200 status

added the optional property commission_next_release_at to the response with the 200 status

added the optional property commission_next_release_usd to the response with the 200 status

added the optional property commission_on_hold to the response with the 200 status