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The number of messages retrieved by this operation is approximate.To get the correct number of sent messages, use LINE Official Account Manager or execute API operations for getting the number of sent messages., that the official account can reach through targeted messages based on gender, age, and/or region.This number only includes users who are active on LINE or LINE services and whose demographics have a high level of certainty.
The number of messages retrieved by this operation includes the number of messages sent from LINE Official Account Manager.
If you use the LINE Things API, you can identify the device that has been linked or unlinked by the user from the device ID acquired by the Webhook event.
For more information about the API, see Getting the product ID and PSDI by specifying the device ID in the LINE Things API reference.
Some properties of these event objects might not have any value.
Generated event objects don't contain properties without any value.