Then you need to decide how you want to do it in Discord
Do you want to use Discord Webhooks? Or a Discord Bot.
Then you need to decide if you want to use Twitch Webhooks, or Twitch long polling
Then you need to decide which language you want to program it in.
Then you need to decide if you are putting this on hosting or something else? As that’ll dictate if you can use Twitch Webhooks or not.
I can’t just “give you codes”, but I can link you to the relevant documentation