Ready for Visa - have anyone tried to mail to HK VAC?

[Decaor2019]

Hi everyone, I am currently in Hong Kong, just got my Ready for Visa email.

It asked me to send passport photos and fees to HK VAC.

However, HK VAC doesn't allow walk-in due to COVID restriction, I can only send the documents to them by mail.

Have anyone tried before? How can I pay the passport transmission fee by mail?

I also saw from their website, it seems I have to fill in a consent form if I submit my documents via mail
https://visa.vfsglobal.com/hkg/en/can/apply-visa

Just wanna see if anyone had the similar experience and give me some guidance?

Thanks a lot!