This is a part that troubles me. I don’t know if it’s ok. I tried to follow this instructions: 1) A client makes an order (wich has products). 2) When the client pays, he gets a bill with information about the order. Is this one ok? https://docs.google.com/drawings/d/1VguWuU9q5eyroJ1WShPYhbrr01E1xXpvwLdwJMHbMjk/edit?usp=sharing Or this one? https://docs.google.com/drawings/d/17qyDPkEbqikFe6FEGm_HqwyRsERZMHhsjhU6m7IobcE/edit?usp=sharingRead more