Hello, does anyone know what redirect uri should be defined to use oauth with ap

There's nothing out-of-the-box that you could use. You could build a servlet plugin to process the callback though. forum.appian.com/.../Custom_Servlet_Plug-ins

Thanks Owen. Would you recommend to use the oauth smart services as a starting point?

If the service you're working with supports OAuth 1.0a and a desktop flow then the OAuth Smart Services will work for you.