Always implement the correct authentication method for API clients as specified in the SDK documentation. Incorrect authentication methods can lead to security vulnerabilities, API access failures, or unintended behavior. **Incorrect example:** ```java Client client = new Client() .setEndpoint("https://.cloud.appwrite.io/v1") .setProject("") .setSession(""); // INCORRECT: Empty session token ``` **Correct examples:** ```java // For API key authentication (server-side) Client client = new Client() .setEndpoint("https://.cloud.appwrite.io/v1") .setProject("") .setKey(""); // For JWT authentication Client client = new Client() .setEndpoint("https://.cloud.appwrite.io/v1") .setProject("") .setJWT(""); ``` Using the proper authentication method ensures your application interacts securely with external services and prevents unauthorized access.