Md. Code, Land Use § 18–501

(a) In this subtitle the following words have the meanings indicated.

(b) “Payment date” means the date of the Commission’s check.

(c) “Proper invoice” means an invoice that:

(1) contains:

(i) the contractor’s federal employer identification number or Social Security number; and

(ii) the contract or purchase order number or other description of the contract; and

(2) contains or is accompanied by substantiating information and documentation as required by regulation or contract.

(d) “Receipt date” means the date that a proper invoice is received by the Commission.