RA 9262, RA 7610, Article 280 of the RPC

Is the end goal to throw him in jail, get money out of him, get him thrown out of the country or all of the above?

What You Need to Know About Child Support in the Philippines - CrowdH

If he tries to run the US state department might get involved.

International Child Support Enforcement

However, there is no reciprocity agreement between the US and the Philippines.

https://www.acf.hhs.gov/css/resource/frequently-asked-questions-about-international-cases#Question 3

Best to get that DNA test before investing too much energy.

I see things in this forum and other forums about the cunning of the woman. I don't know either party, is it safe to assume you know both of them well?

 

Spoken like a true Web designer. lol

 

In Ph family law there is a duty to support. I've only ever met one single mother who was pursuing a putative father in court.
That was in Manila. There must be money available, of course. You can't get blood from a stone.