I liked that the aggregator had an easy-to-use API. So, what I did was: I logged in rather quickly, added the shop I needed and customized payments according to my needs. Which took me minimum effort. I didn't have to deal with various services, which I am anyway not good at and could have easily get lost in them. As I am a newbie in the field of cryptocurrency, it suits me that paykassa does everything by itself. The only inconvenience happens when you want to take money. I had this problem several times. I need to get money ASAP and at the end I get delay. Guys, it's not how one should do business.