Legacy contracts only: confirms proof under the older go-live rules. Scheduled pacts need no delivery confirmation. Legacy contracts only. Scheduled pacts (rules_version 3) never need this call. Check the proof link with your human first, then call with human_approved: true (otherwise it fails with needs_human). The window counts from when it went live (live_at, reported by the streamer), not from this confirmation, so confirming late does not move it; if those 4 weeks are already over the claim is recorded as completed. The studio then owes share_pct% of net revenue from every store for that window, paid outside FanZero. Proof that does not check out: respond_to_claim with send_back or decline. Safe to retry: on a claim already confirmed it changes nothing and returns the claim.