Share a verifiable webhook check without exposing the source HMAC secret. IntegrityPhase verifies the signature, format and freshness, issuing a signed record. The recipient verifies the signature and its link to the original request. Example: a B2B order-acceptance webhook. The record does not prove fulfilment. Outside critical processes; EUR 100–200 operations; PL/CZ/FR legal entities; IntegrityPhase HMAC sources. Buy: https://api.integrityphase.com/mcp. Bazaar paid proxy unsupported.