I like the ideas behind taler. » GNU Taler is an open protocol for an electronic payment system with a free software reference implementation. GNU Taler offers

I like the ideas behind taler. » GNU Taler is an open protocol for an electronic payment system with a free software reference implementation. GNU Taler offers secure, fast and easy payment processing using well understood cryptographic techniques. GNU Taler allows customers to remain anonymous, while ensuring that merchants can be held accountable by governments. Hence, GNU Taler is compatible with anti-money-laundering (AML) and know-your-customer (KYC) regulation, as well as data protection regulation (such as GDPR). https://docs.taler.net/taler-merchant-api-tutorial.html https://docs.taler.net/taler-merchant-api-tutorial.html