The two methods that seem feasible are making it hard to copy (putting it in the secure element in your phone, for example, which I don't love) or doing tokens that can only be used a limited number of times per day, like in : https://eprint.iacr.org/2006/454
The two methods that seem feasible are making it hard to copy (putting it in the secure element in your phone, for example, which I don't love) or doing tokens that can only be used a limited number of times per day, like in : https://eprint.iacr.org/2006/454