Method: channels.getSendAs

Obtains a list of peers that can be used to send messages in a specific group

Parameters:

Name	Type	Description	Required
peer	Username, chat ID, Update, Message or InputPeer	The group where we intend to send messages	Optional

Return type: channels.SendAsPeers

Can userbots use this method: YES

Can bots use this method: NO

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();

$channels_SendAsPeers = $MadelineProto->channels->getSendAs(peer: $InputPeer, );