Method: stickers.addStickerToSet

Add a sticker to a stickerset, bots only. The sticker set must have been created by the bot.

Parameters:

Name	Type	Description	Required
stickerset	InputStickerSet	The stickerset	Optional
sticker	InputStickerSetItem	The sticker	Yes

Return type: messages.StickerSet

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_StickerSet = $MadelineProto->stickers->addStickerToSet(stickerset: $InputStickerSet, sticker: $InputStickerSetItem, );