Asana API Personal Token

Hi, Can I use Asana API personal Token for application in production(on the backend)? (If I store it securely)

Yes, you could. Asana recommends OAuth tokens for general security purposes - and you’d need to use those if you’re wanting to access data from lot of Asana accounts other than yours or perhaps a few other people where you would get PATs from them. But Asana doesn’t impose any restrictions that you can’t use a PAT in a production application.