@tmanito I did this when I was still in PH in 2017. I coordinated with POLO Canberra (called them to check the step by step process). Sent them the documents via email (PDF) and then paid them through bank transfer and then they sent me the signed documents with red ribbon after a few weeks. This is the document I used to get my OEC so that I can exit Manila going to Sydney.
I had to coordinate it on my own as our HR couldn't be bothered to do it. =(