We had a lot of projects related to blockchain payments, especially during the 2017-2018 bullrun, but at the moment I don't know which projects are working really well. Besides, current cryptocurrencies like ETH, BNB, TRX or stable coins like USDT, USDC, PAX, DAI are also very suitable for payment. If you have some truly groundbreaking solution to this field, go ahead with your project. If not, think again and find that solution. Conducting a crypto project is not easy, it is expensive and difficult.