Get all subscribers

API
4
  1. Go to your website
  2. Click login with Twitch
  3. accept (or decline) the account linking between the ClientID and your Twitch Account
  4. This normally retuns to your website with a ?code
  5. Exchange the ?code for a token
  6. Use “Get users” or “Validate Token” to get the user ID
  7. User the userID and the token to call “Get Subscriptions”

This works the same regardless of which user you want subs for. First step is getting a USER token with the relevant scopes attached to said token. And the User providing positive linking