Method: channels.updateColor

Parameters:

Name	Type	Required
channel	Username, chat ID, Update, Message or InputChannel	Optional
color	int	Yes
background_emoji_id	long	Optional

Return type: Updates

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();

$Updates = $MadelineProto->channels->updateColor(channel: $InputChannel, color: $int, background_emoji_id: $long, );