Check one contribution with the contributionId and receiptToken returned by submit_contribution: its status (pending, in_review, needs_revision, accepted = reflected, not_accepted = not reflected), the reviewer's response — a request for changes or the reason it was or was not reflected — and its history. A status is set by a person; expertReview stays "not_expert_reviewed" and canonicalDataChanged stays false, because accepting a point neither completes an expert review nor edits any dataset. An unknown id and a wrong receipt return the same not-found error. Read-only.