There is unfortunately no Chinese embassy in Hong Kong, as the city is technically part of China now, its special status makes it hard to gain access to Chinese official documents. it has a Chinese ’intermediary‘, that helps with appying for other visa and docuemnts, but not PCC, and also, the PCC requires past record of my parents stay in China, which it’s been decades since they left and there I am not sure if they have anything to prove their old residency, so not sure if they can still apply for the PCC. If anyone has similar experience in the past, I would love to learn how it was being handled. thanks!