Method: messages.unpinAllMessages

Unpin all pinned messages

Parameters:

Name	Type	Description	Required
peer	Username, chat ID, Update, Message or InputPeer	Chat where to unpin	Optional
top_msg_id	int	Forum topic where to unpin	Optional

Return type: messages.AffectedHistory

Can bots use this method: YES

MadelineProto Example (now async for huge speed and parallelism!):

if (!file_exists('madeline.php')) {
    copy('https://phar.madelineproto.xyz/madeline.php', 'madeline.php');
}
include 'madeline.php';

$MadelineProto = new \danog\MadelineProto\API('session.madeline');
$MadelineProto->start();

$messages_AffectedHistory = $MadelineProto->messages->unpinAllMessages(peer: $InputPeer, top_msg_id: $int, );