Use this method to clear the list of pinned messages in a chat.
If the chat is not a private chat, the bot must be an administrator in the chat for this to work and must have the 'can_pin_messages' admin right in a supergroup or 'can_edit_messages' admin right in a channel. Returns True on success.
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create(integer|string $chatId)
integerstring
$chatId : integer | string