How does the coin machine at Walmart work?

Could you elaborate on the functionality of the coin-counting machine typically found at Walmart? Specifically, I'm curious about the process from start to finish. How does one insert coins into the machine? What sort of sorting mechanism does it utilize to differentiate between different denominations? How accurate is the counting process? Additionally, does the machine offer any form of compensation, such as a receipt or electronic voucher, for the value of the coins counted? Understanding the inner workings of this machine would greatly assist in my comprehension of its practical application.