title: Is it possible to have multiple valid access tokens with the same client credentials?
body: <p>I have an API set with OAuth2 authentication. A client has subscribe to my API using WSO2.
  We don't use refresh tokens. All access tokens expire in 1 hour.</p>
  <p>What happens if my client requests 2 access tokens with the same client credentials?
  Will the first token be revoked or will both tokens live 1 hour?</p>