Authentication

Use User OAuth (authorization code) when you want messages/actions to appear as a user.

• Typical endpoints:
  • Send message (as the user): POST /v2/chat/users/me/messages
• Typical scopes:
  • chat_message:write
  • chat_channel:read (for listing channels)

Chatbot API (bot-level)

Use client credentials when you want messages/actions to appear as a bot.

• Typical endpoint:
  • Send bot message: POST /v2/im/chat/messages
• Typical “scope”:
  • imchat:bot (added by enabling Chatbot feature on the app)

Decision Checklist

• If you need to post to a channel “as a bot” and handle slash command interactions: use Chatbot API.
• If you need to post “as the user” (and respect the user’s channel membership): use Team Chat API.

Common Pitfalls

• Server-to-Server OAuth is not a fit for Zoom Team Chat chatbot features.
• Team Chat API calls require a user token with the right scopes; “invalid access token” errors are almost always missing scopes or wrong app type.
• OAuth URL split is easy to mix up:
  • authorize step: https://zoom.us/oauth/authorize
  • token step (all grant types): https://zoom.us/oauth/token
• In browser demos, complete OAuth end-to-end in app (state verify -> callback -> code exchange -> token store) to avoid copy/paste mistakes.