Do I need to pay my Philhealth contributions immediately?

I'm a fresh grad, nag aasikaso ng mga government ID'S. Kakakuha ko lang ng PhilHealth membership kanina, and they said I need to pay agad agad 500 per month na contribution even though I'm a first time job seeker.

Ok lang ba na hindi muna makapag bayad? Naka list as voluntary yung membership ko. Mag a-accumulate ba yon kapag hindi pa ko nakapag bayad agad? (Still finding work)