How to get payload?

Question

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For the VKontakte bot in Python, I did not find a way to find out the payload, and if there was, then they sent the buttons json with a scheme or the methods themselves were different.

In one of the videos on YouTube, I heard that payload can only be set in add_callback_button , but that's bad luck, in the ide tips it says that this argument can be set in other buttons as well. How to check if there is a payload, get it and install it.
The code:

session = vk_api.VkApi(token="токен")
longpoll = VkLongPoll(session)

for event in longpoll.listen():
    if event.type == VkEventType.MESSAGE_NEW:
        if event.to_me:
            user_id = event.user_id
            message = event.text

Answer 1

payload = event.payload