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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I agree. I didn't understand what "check" was at first. After looking at the examples, I could see it was ACTUALLY just a money transfer with an account balance and authorisation check between the 2 people. After I realised that, I solved it in minutes.
As a non native English speaker, I agree with @blopezpi. And after looking at the docstrings of some of the solutions, others felt the need to clarify what this method does.
The method that you named as "check" is not really understandable. Please can you change the name with one more describable like transfer_money or something like that?