Constructor: stickerPack
A stickerpack is a group of stickers associated to the same emoji.
It is not a sticker pack the way it is usually intended, you may be looking for a StickerSet.
Attributes:
Type: StickerPack
Example:
$stickerPack = ['_' => 'stickerPack', 'emoticon' => 'string', 'documents' => [long, long]];