Dear K.Krongkeaw, K.Pongpan ka,
Refer to my discussion with K.Krongkeaw, right now, MK using the K-Payment Gateway as below:
Payment : Re-Direct to K-Payment Gateway Payment Page
Void : MK Users login to K-Payment Gateway Online Merchant Report to select transactions for void manually
Settlement: MK use the auto-settlement
So, right now, MK do not use any Direct Message with K-Payment Gateway, MK do not have to test the issue of SSL3.0 ka.