// Png image with the sticker, must be up to 512 kilobytes in size, dimensions must not exceed 512px, and either width or height must be exactly 512px. Pass a file_id as a String to send a file that already exists on the Telegram servers, pass an HTTP URL as a String for Telegram to get a file from the Internet, or upload a new one using multipart/form-data. More info on Sending Files »
PNGStickerinterface{}`json:"png_sticker"`
// One or more emoji corresponding to the sticker
Emojisstring`json:"emojis"`
// A JSON-serialized object for position where the mask should be placed on faces