A lock extension request uses the addLockEvent call. The extension request lock request consists of three steps:

1. Check lock desk hour to ensure the extension request will be accepted.
2. Check extension day availability to ensure that the lock is extendable to the desired date.
3. Check rate period to ensure the rate is still active.
4. Add request lock event, using the addLockEvent call. In the body of the call, create a LockEventExtensionInfo object to provide the details of the price concession.

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