My kids ages 5 and 9 will be going to Hongkong with me for 9 days. We hold Phlippine passports. We do not have time in the Philippines to apply for a visa in advance to be able to go to Shenzhen as well because my kids will be receiving their passports just a few days before our flight. Can Philippine passport holders apply for visa for Shenzhen while in Hongkong? How long does it take? Where do we need to apply and how much will it cost? Thank you.