View Source ExTDLib.Object.ChatEventStickerSetChanged (ExTDLib v0.0.4)

The supergroup sticker set was changed.

NameTypeDescription
old_sticker_set_idstringPrevious identifier of the chat sticker set; 0 if none.
new_sticker_set_idstringNew identifier of the chat sticker set; 0 if none.

More details on telegram's documentation.