Kabayan, one piece of advise! Just follow the instruction given by the DHL staff. They are the official carrier of Qatar Embassy in Philippines. All the information you mentioned about DHL requirements are authentic, including payment charge.

Reduce your headache and just provide them what documents they ask you to produce. Do not believed and ask any others opinion, which is all hearsay, it will only mislead you.

I have my family's documents process 2years ago with the same requirements you have mentioned.

Goodluck!