Sending a invoice to DEPT OF TREASURY

What is PAY? definition of PAY (Black's Law Dictionary) Definition of PAY: To pay is to deliver to a creditor the value of a debt, either in money or in goods, for his acceptance, by which the debt Is discharged.

What is PAY? definition of PAY (Black's Law Dictionary)

So could someone (that is a secured party) send a invoice to a certain government office by certified return receipt signature confirmation and ask them to return payment for their hours of service? And if they were to do so and did not get paid by the debtor would it be a breach of contract?

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