How to make the VK bot reply to a message (reply)?

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I’m creating my own bot, I made it answer “hello” messages, but I want it to answer with an answer, I read in the documentation that you need to use reply_to, but that’s not the task, I don’t understand where to shove this reply_to, and how to receive message IDs, here my code:

vk.updates.hear(/^(?:привет)/iu, msg => {
  msg.send(`Приветствую`)
})

Thanks in advance!