Are there any Recommended Clocks to be used with OTL

Summary:

The Customer is a Utility Management services company and employee can work in multiple locations in a day and report it against a work order or project.

They are facing challenges currently in capturing employees time and reporting it to payroll.

Has anybody worked on this kind of engagement earlier? Are there any simple clocking machines which can capture time and can be integrated with otl.

Are there any suggestions or standard integrations available with physical clocks.