You can retrieve data by specifying ActivityType IDs. Each Marketo subscription may have different IDs for corresponding Activity names. The following table shows ActivityType ID, corresponding name, and description from a sample Marketo subscription:

ID	Name	Description
1	Visit Webpage	User visits a web page.
10	Open Email	User opens Marketo email.
11	Click Email	User clicks on a link in a Marketo email.
12	New Lead	New person or record is added to the lead database.
13	Change Data Value	Changed attribute value for a person or record.
34	Add to Opportunity	Add to an opportunity.
35	Remove from Opportunity	Remove from an opportunity.