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KTC will be enhancing the Payment Gateway system on Friday, April 17, 2026,
from 5:00 AM to 8:30 AM. During this period, KTC cardmembers and merchants will be temporarily unable to access the Payment Gateway and related online payment systems. 

For assistance, please contact:

• Customer Service Center at KTC PHONE 02 123 5000

• Merchant Service Center Tel. 02 123 5700

We apologize for any inconvenience this may cause.