As used in this article--
"Local authority" shall mean a municipal authority or any other body corporate and politic created by one (1) or more political subdivisions pursuant to statute.
"Political subdivision" shall mean any county, city, borough, incorporated town, township, school district, vocational school district, county institution district, local authority or any joint or cooperative body of political subdivisions having the power to enter into contracts.
"Proper invoice" shall mean an invoice which contains or is accompanied by substantiating documentation as the political subdivision involved may require by regulation or contract.
"Qualified small business concern" shall mean any independently owned and operated for-profit business concern, including any person engaged in a trade, employing one hundred or fewer employes operating as a contractor with a political subdivision.
"Received invoice" shall mean any invoice received by a political subdivision on the later of:
72 P.S. § 1602-C