Atleast in the US, Visa backed by a bank. 7 transactions per second versus 24,000 transactions per second. Banks are fdic insured and handle security for you. You might be capable of securing a private key that you actively use like a debit card number, but I'm not confortable with it and there's no way I'd let my aging parents near financial vulnerability like that with an 80 foot pole. As much as we all hate banks and all the bad they do, they provide necessary services.
if you compare centralized vs decentralized with tps you really don't get what's all the deal about no government control and immutable ledgers. downvote away and think about this comment in 10 years.
It would be nice if AWS provided mocks but the reality is that's there is more than one lib for creating stubs and mocks for every language. Additionally, I would assume that AWS want's to steer clear of making those types of decisions for the developer. The "what lib do I use for x" decisions that developers have to make.
Unit tests are all you should really need. Mock the AWS services and make sure to assert, where you can, the arguments being sent to those services and you should have enough coverage to get the job done.
My guess is that this was built for practice. That said, some of the data is coming back bad. The 'url' property contains an address that is missing the 'u' and 'a'. https://ghibliapi.herokpp.com
