Revoking a bearer token involves invalidating the token, making it no longer valid for authentication or authorization. The exact method for revoking bearer tokens can vary depending on the authentication and authorization system you're using. Here are some general steps and methods for revoking bearer tokens:

Token Expiration: The most straightforward way to revoke a bearer token is to let it expire naturally. Bearer tokens typically have a limited lifespan, and when they reach their expiration time, they become invalid. The client will need to obtain a new token to continue accessing resources.

Token Blacklisting: Maintain a list (often referred to as a blacklist) of revoked tokens on the server. When you want to revoke a token, add it to this list. When a client presents a token for authentication, you can check if it's in the blacklist. If it is, deny access.

Token Versioning: Change the token version or key used to sign the token. This effectively invalidates all tokens issued with the previous version or key. Clients presenting tokens signed with the old version will be denied access.

Token Revocation Endpoint: In some authentication systems, there is a dedicated endpoint for token revocation. Clients can send a revocation request to this endpoint with the token they want to revoke. The server then invalidates the token.

Token Refresh: If you're using refresh tokens in conjunction with bearer tokens (e.g., in OAuth 2.0), you can revoke a bearer token by revoking the associated refresh token. When the client attempts to use the refresh token to obtain a new bearer token, it will be denied, and the old bearer token becomes invalid.

Manual Removal: In some cases, you might need to manually remove a token from the client or server's storage. For example, if a user logs out, you can delete the token from their client device. On the server, you can delete the token from any active sessions or storage.

Token Time-Based Revocation: Implement a system that allows tokens to be revoked based on time. For example, if you need to revoke a user's access for a specific period, you can set the token's expiration to the time when access should be restored.

It's important to note that the method you choose for revoking bearer tokens depends on your specific authentication and authorization system. Some systems might not support token revocation at all, while others offer more advanced features for managing token revocation and renewal. When implementing token revocation, consider the security implications and the impact on your application or system's overall architecture.