Schema to Create Custom Activites Hi i want to understand how the schema for creating custom activities work. Here is the link for reference Add Custom Activities » Marketo Developers My question is regarding Primay Attribute. So from what i understand this has to be a unique key.For example here is a signup custom event i want the marketo support team to create.Name: [org] Created ProjectDescription: [org] Created ProjectTrigger Name: [org] Created ProjectFilter Name: [org] Created ProjectPrimary Attribute: Project Name , Project Name, stringOther Attributes: Username , Username , stringOther Attributes: User ID, User ID , IntegerOther Attributes: Project Slug , Project Slug , stringSo in the example above a user can create multiple projects and we want to track every event, in that case should the Username be a primary attribute of Project name?