How to make requests to VK API, and not duplicate information?
How to make requests to VK API and when receive the data, duplicate them, and to check there is in my application already or not?
Want to make a bot for Telegram to parse posts from the VC through its API. But I don't know how to do so, that would not be duplicates.
How to get data only when they are updated?
Like on the wall I have a new post here only to pick it up.
How this is done in VC clients for iOS and Android?
How can that be done?