I can't find any "actions" API request that returns a 'deleteCheckItem' action. I tried '/boards/[id]/actions', '/cards/[id]/actions', I also tried '/checklists/[id]/checkItems' and some others.
Nothing returns any 'deleteCheckItem' action. Am I looking at the wrong place ?
Certain action types are not returned by the Trello API. deleteCheckItem is one of them.
Further explanation and complete reference is available here: