First, welcome to the forum. Second, there are many shopping companies with shops in Manila. At the bottom of every page on this forum is a list of verified Mystery Shopping Companies. Sign up with as many as you can--the more you sign with, the more chances to find shops in your area.
There is also a link for new mystery shoppers at the bottom of the page in the same section. It has a wealth of useful information, so I highly suggest reading it.
If you still have questions, we are here to help.