I will be visiting hk i wanted to go shenzen but depends on my time.

If ever i will get a break would it be possible for me to get my visa in hongkong cos if i get now im not sure yet whats my schedules there.. I wanna know if ever i decided to go shenzen is it possible for me to get the visa there im filipino .. And i would like to ask for the rquirements that is possible be needed..thank u