delivery confirmation, proof that a delivery has been made, an invoice, a document which shows how much a customer has to pay, for what and by when, payment terms, the conditions of when a customer should make payment, an extension, when more time is allowed for something, cash flow, the timing and amount of money coming in and going out of a company, a regulation, an official or organisational rule, an exception, when something doesn't follow the usual rule, to appreciate, to show someone you are grateful for something they have done

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