You can derive the URL from the user's service document. Find the value of the href attribute of element that contains a title element which has a value of Overview.
This returns a feed of active activities of which you are a member. The activities in the feed are the same activities that populate the My Activities view in the user interface. This feed is also the same as the Overview feed listed in your Activities service document. You can work with the activities in this feed in the same ways as you could if you retrieved them from the Overview feed in the service document. See Working with activities
for more information.
Use one or more of the input parameters to narrow the search. Separate multiple parameters with an ampersand (&).
Working with activities programmatically
Getting a person's user ID in Activities