What is WPS and does my restaurant have to use it?

In the UAE, the Wage Protection System (WPS) is the mechanism through which salaries must be paid, administered via the Ministry of Human Resources and Emiratisation, so that wages are paid in full and on time through approved channels. It is not optional for covered employers. Other GCC markets run their own wage-protection equivalents. Beyond compliance, it imposes a useful discipline: payroll is a fixed, on-time obligation your cash flow must always be able to meet.

From Restaurant Staffing Costs: Visas, WPS and the Real Price Per Head — the full reading, with the method behind this answer.