What does the method 'verifyAndDecode' in the SDK accomplish?

The method 'verifyAndDecode' in the SDK is primarily used for verifying signed requests. When a system sends a signed request, it includes a signature that ensures the request has not been tampered with and was indeed sent by a trusted source. The 'verifyAndDecode' method accomplishes two tasks: it verifies the integrity and authenticity of the request by checking the signature against the expected value and decodes the payload of the request for further use.

This is a critical operation in scenarios where security is paramount, such as when dealing with authenticated API requests. This method ensures that the application can trust the data it receives and safely process it without the risk of malicious modifications.

The other options, while relevant in the context of application security and data handling, do not represent the primary function of 'verifyAndDecode'. The method does not specifically decode OAuth tokens, retrieve user profiles, or check app permissions, which are handled by different methods and processes in the SDK. Understanding the core purpose of such a method is crucial for integrating secure authentication practices within applications.