You can do a GET call to `
https://api.getguru.com/api/v1/cards/{card id}/versions` and that'll give you a list of all versions, including who made the change.
That's only one card at a time though. To get this in bulk you can use the
analytics API and look for `fact-updated` events. These events will have the user's email and the card ID, but won't have any other details about the card.
If you're looking for something like search results where it's a list of cards
plus all the users who have modified it, then there's not a single call for that.