String with 1-20 emoji corresponding to the sticker.
Format of the sticker.
List of up to 20 keywords with total length up to 64 characters, which can be used to find the sticker.
Position where the mask is placed; pass null if not specified.
File with the sticker; must fit in a 512x512 square. For WEBP stickers the file must be in WEBP or PNG format, which will be converted to WEBP server-side. See https://core.telegram.org/animated_stickers#technical-requirements for technical requirements.
A sticker to be added to a sticker set.