Step 2 of DocuSign Auth Code Grant, uses the code that was generated from auth_code request

GetAccessToken.java

// Use the authorization code that was added as a query param to the redirect URI.
// from the previous request. You should set up a route that handles the redirect
// and parses the code so you can then pass it to token endpoint:
String code = "{ENTER_YOUR_AUTHORIZATION_CODE}";
// assign it to the token endpoint
apiClient.getTokenEndPoint().setCode(code);

// optionally register to get notified when a new token arrives
apiClient.registerAccessTokenListener(new AccessTokenListener() {
    @Override
    public void notify(BasicOAuthToken token) {
        System.out.println("Got a fresh token: " + token.getAccessToken());
    }
});

// following call exchanges the authorization code for an access code and updates 
// the `Authorization: bearer <token>` header on the api client
apiClient.updateAccessToken();