accuchex.com/products-services/services/payroll-services/payroll/certified-payroll/

This page gives a good overview of certified payroll. Certified payrolls are a specialized process involving the input of a date and job code with each entry. This is used to generate a report, in a specified format, of hours worked and labor costs for a particular job. The report presents data on a daily basis for a period of one week; multiple reports may occur within the same payroll cycle, and a single certified payroll report may span into two payroll dates. The Accuchex report can include work classification, and it is in compliance with the Wage and Hour Division of the U.S. Department of Labor, using their form WH-347.