There isnt api for activities tab in zoho crm ??

I am working on open source app which uses all the features of zoho. I am able to access all the fields in all modules like "leads", "contacts","potentials" but when i try to access activities it says "Invalid parameter value" below is the url i am using https://crm.zoho.com/crm/private/xml/Activities/getMyRecords?newFormat=1&apikey=0QL3CBw8Aaptvsj8L0icYKjtJ2x45yNHkQaMGWeIdlI$&ticket=e7fdd4464c5bdbc1a2dce9ef04d78d94

This is test environment so i have provided api key and ticket also