Method: messages.setChatWallPaper

Set a custom wallpaper » in a specific private chat with another user.

Parameters:

Name	Type	Description	Required
peer	Username, chat ID, Update, Message or InputPeer	The private chat where the wallpaper will be set	Optional
wallpaper	InputWallPaper	The wallpaper », obtained as described in the wallpaper documentation »; must not be provided when installing a wallpaper obtained from a messageActionSetChatWallPaper service message (`id` must be provided, instead).	Optional
settings	WallPaperSettings	Wallpaper settings, obtained as described in the wallpaper documentation » or from messageActionSetChatWallPaper.`wallpaper`.`settings`.	Optional
id	int	If the wallpaper was obtained from a messageActionSetChatWallPaper service message, must contain the ID of that message.	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->messages->setChatWallPaper(peer: $InputPeer, wallpaper: $InputWallPaper, settings: $WallPaperSettings, id: $int, );