Client certificate authentication is no longer available because the free trial / contract has ended. If I purchase the service now, will I be able to use it right away?
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If you order the service again within 30 days after the expiration of your trial period or license period (within the grace period), you can continue using the Client Certificate Authentication. Once you make a contract, the same client certificate become valid again as you used before.
After the grace period, the client certificate used for this service becomes invalid and cannot be used again.
When making contract again after the grace period, reset Client Certificate Authentication, and issue a new client certificate to each user.