channelId only contains number and userId only contains alphabet?

Could someone please help to confirm that the messageing channel Id only contains number, and the line user id only contais alphabet ? Thanks in advance.

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LINE uses rooms, groups and users as messaging delivery points. These are each a combination of letters and numbers so you will see both. The channel you create in the dev console is a string of numbers but is now a message delivery endpoint. You would use the channels' User ID as the delivery endpoint if you wanted to send a message there. Does his help answer your question?

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本当によろしいですか? question.vm