In this article from Pepper.ph, the author gives you an insight on what Service Charge is all about -- what it is, how it's computed, if all employees benefit from it, if it's included in an employee's wage, if tipping is mandatory in all establishments, and if tips are distributed among the employees in the same way as Pooled Service Charges. In a nutshell, tipping isn't exactly required in the Philippines but feel free to leave a few coins or a thank you note on an unused tissue to brighten up your server's day. To know more about the basics of Service Charge, click the link below.
Source: Pepper