Free Square accessibility, is there any?

iOS & iPadOS
Hello all. I've seen that you can download a free app, and using a free creditcard reader, take creditcards and do other things, even emailing and texting receipts. Is anyone using this app, and if they aren't I'm willing to see what I can do about finding out how accessible it is. I don't have a business, but I wanted to see how far it will let me go through. I'd be interested to hear from anyone who uses or tried this app. Again, it's called Free Square and it is, free.