Originally Posted by Barry-xlovecam

Sounds to me like you could just make a spreadsheet form template.

Title it: [payment period] Work Report

Project Name|Tasks Completed|Contracted Price|Invoiced Amount

Maybe a little more complex to suit your needs. You said hundreds of people and I assumed you meant simultaneously and not cumulatively. A spreadsheet might be the simplest user interface then you could manually input the data into a MySQL database for record keeping. You just need a database.table design and someone that knows mysqlmonitor CLI or phpMyAdmin.

You could get someone to script this with a web form and a PHP / MySQL back-end this would be a trivial task and I am sure there is no shortage of developer/coders around here to do this.

I think you could find a script already made and just do some revisions and customization then run it on your own servers.