Bad Request - The request cannot be processed due to a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).

The request is valid, but server authentication failed to verify the identity. The user's access token has either expired or is not valid. Creating a new token might resolve the issue.

The request was valid, but the server is refusing action. The user might not have the necessary permissions for a resource, or may need an account of some sort. This status is similar to 401, but in this case, re-authenticating will make no difference. The access is permanently forbidden and tied to the application logic, such as insufficient rights to a resource.

The requested resource was not found. This response indicates that the server can't find the requested resource. In the context of an API, this can mean that the endpoint is valid but the resource itself does not exist. For developers, this typically means that the URL or its content (such as specific ID) does not exist. Check the URL and the resource identifier.