With the 1.0a revision of the OAuth 1.0 specification, the callback URL is provided at the time the request is made for a request token and will be used when redirecting the user back to the OAuth 1.0 consumer. Therefore, a means must be provided to persist the callback between requests. The interface that is used to persist callbacks is OAuthCallbackServices. The default implementation, InMemoryCallbackServices persists the callbacks in-memory. You must supply your own implementation of OAuthCallbackServices if this is inadequate.