Right, so I'll just go ahead and start setting MTU packet sizes, and opening sockets when trying to calculate and send a invoice. Instead write code operating

Right, so I'll just go ahead and start setting MTU packet sizes, and opening sockets when trying to calculate and send a invoice. Instead write code operating at the level that best expresses the problem you're trying to solve. As if you are writing a business document to explain it. Fill in the concrete details afterwards. If your doing invoices, solve the problem at level of invoices, transactions, percentages, addresses, tax and emails. Best expressed as outside in