Overview Twilio supports four authentication methods. Choosing the wrong one is a security risk — Auth Tokens in production code are the most common credential leak. | Method | Use for | Token lifetime | Revocable individually | |--------|---------|---------------|----------------------| | Auth Token | Local testing only | Permanent (until rotated) | No — rotation breaks ALL API keys | | API Key + Secret | Production server-side | Permanent (until deleted) | Yes | | OAuth2 Bearer Token | Production server-side (enhanced) | 1 hour | Expires automatically | | Access Token (JWT) | Client-side SD…