The first time I came into contact with BTC, I felt that there was little difference between e-payment and BTC. However, with the gradual understanding, e-payment and BTC are becoming more and more different.
 In essence, electronic payment is the circulation of legal currency in one or some countries, while BTC is the circulation all over the world（ If every country agrees)
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I'd discover BTC way back in 2018 and I have no idea about the difference between crypto to e-commerce since both are using the digital modes of payment. However, I just realize it a year after exploring cryptocurrency. What makes the system used in BTC different from electronic payment is being decentralized and not being regulated nor monitored by the government. Also, BTC is not really a legal currency that could only exist and be useful in the crypto world but it could be exchanged into fiat money.