How to respond to a user coming into a vk_api python conversation?

Question

Python

Hello members of the forum, how should I react to the arrival of a user in a conversation?
there is this code:

# ------- longpool ---------
for event in longpoll.listen():
    if event.type == VkBotEventType.MESSAGE_NEW:    # реакция на новые сообщения

It reacts to new messages (VkBotEventType.MESSAGE_NEW), and I need it to react to the user entering the conversation.
How to do it?

Answer 1

if event.obj['message']['action']['type'] == 'chat_invite_user':
vk.messages.send(
peer_id=peer_id,
message='hello', #bot response
random_id=get_random_id(),
)