You can preselect items for your users on the Access View. A selections object contains keys that are a colon delimited pair of the Slice Slug and the Ingredient Id of the Ingredient used in the slice.
{
"{Slice Slug}:{Ingredient Id for Slice 1}": [{List of values}],
"{Slice 2 Slug}:{Ingredient Id for Slice 2}": [{List of values}]
}
You can find the Slice Slug in the editor.
The Slice Name
The Ingredient Id can be found by selecting the Ingredient grouping used in the slice, then selecting "Copy Ingredient Id" in the ingredient editor.
Getting the Ingredient Id
Making selections in a chooser
Choosers can just include the chooser slice name.
For choosers, you need to get the Ingredient Id for the Ingredient you want to select
Finding Ingredient Ids for a Chooser
To select the third "Count of Date and Time" ingredient in the chooser above, you'd use this selections object.
Making selections in the Access View URL.
You can also make selections using the url. To do so, pass the data like this:
Here's an example of a complex selection that selects one choice and two items on a leaderboard. All of this would appear on a single line, but we're splitting it to make it easier to read. Note that spaces need to be url-encoded by replacing them with a "+" sign or "%20".