To expire user sessions after 1800 seconds in a mobile app using SAP Customer Data Cloud, you should set the sessionExpiration parameter to 1800 seconds when callingaccounts.login.
* Setting Session Expiration:
* When implementing the login functionality, ensure that you include the sessionExpiration parameter in your API call.
* Example API call:accounts.login({"sessionExpiration": 1800, ...}).
This will ensure that the user sessions expire after 1800 seconds of inactivity.
References
* SAP Customer Data Cloud API Documentation

To ensure you use the correct public key when validating a JWT, you need to check:
* The keyid of the public key is the same as the keyID in the JWT header: This ensures that the correct public key is used to validate the signature of the JWT.
Matching thekeyidhelps in selecting the correct key from a set of keys, ensuring the JWT validation process is accurate.
References
* JWT Validation Guide