[moooo99]

This sounds like a fun idea, but similar to ehacke I doubt this would be legal. Payment processing is pretty complex and heavily regulated, making this an even harder project.

There are some projects that want to make credit card payments more anonymouse. There are some cryptocurrency credit card providers that have a license to operate, but using cryptocurrencies comes with its very own set of problems.

Another way would be to use privacy.com. They allow you to create multiple credit cards with individual spending limits or ones for single use. So you could have one credit card for your netflix subscription, another one for your Spotify subscription and so one. Unfortunately their service is only available to U.S customers and I couldn't find any alternative for EU customers (if you know of any, please let me know).

I can't try privacy.com myself, but from what I've read an heard, this seems like the most promising option for private credit-card payments.

[ploika]

You can use Revolut in the EU to create virtual credit cards. I haven't used the service myself (though I do use Revolut), but it seems similar enough to what privacy.com offers.