categoryId and category

categoryId is your ID for the category or collection. category is its name. Send both on view_category.

Type	Example value
`string`	`298765`

Sample payload with every parameter for view_category:

window._upstack('track', 'view_category', {
  // Standard parameters
  categoryId: '298765',
  category: 'Summer 2026',

  // User data
  email: 'jane@example.com',

  // Custom data
  sortOrder: 'best_selling',
  filterApplied: 'size_medium'
});

Required on: view_category