nostr:npub12rv5lskctqxxs2c8rf2zlzc7xx3qpvzs3w4etgemauy9thegr43sf485vg , is there currently a feasible easy way to build this kind of service-specific credit system without user accounts? 

For example, if someone wanted to create a website with a credit system similar to a real-life arcade (user buys credits with money, and credits can only be used for the games within that arcade place), how could they get started?