Bingo & Bae stickers (FLYER): 20 stickers, 512 x 512, transparent.

png/           PNG for Telegram (@Stickers bot) and for sending as an image on Zalo or Messenger
webp/          WebP under 100 KB each, for WhatsApp sticker-maker apps
tray-96.png    WhatsApp tray icon (96 x 96)
icon-100.webp  Telegram pack icon (100 x 100)
stickers.json  file, caption, emoji and when to send each sticker

Telegram: open @Stickers, send /newpack, name the pack, then for each sticker send the PNG as a file followed by its emoji (see stickers.json). Finish with /publish.
WhatsApp: use a sticker-maker app and import the webp/ folder with tray-96.png.
Zalo / Messenger: there is no self-serve sticker store; send the PNG as an image, or submit the pack through the platform's partner programme.

Characters: Bingo (FLYER mascot, official model sheet) and Bae (Mymy's pug from the FLYER game story).