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A receiver URL was a bare v4 UUID and nothing else: anyone who learned it could store events and, because inbound headers are forwarded to targets almost verbatim, choose what the downstream service received. Entrypoints gain an optional scheme/secret pair. GitHub's X-Hub-Signature-256 (HMAC-SHA256 hex over the raw body) and GitLab's X-Gitlab-Token (plain shared token) are supported; both compare with hmac.Equal. With nothing configured an entrypoint behaves exactly as before, which is also where every pre-existing row lands after AutoMigrate adds the columns. Verification runs after the capped body read and before the first write, so a rejected request leaves no event row, no delivery row and no delivery task. A configuration the receiver cannot apply — unknown scheme, or one half of the pair missing — is refused with a 500 rather than falling back to unverified. The secret is credential-bearing and is stored in the clear because HMAC needs the key itself. It is excluded from JSON, kept out of templates by a new handlers.EntrypointView projection, and absent from every log line including the rejection path. The UI sets and rotates it through one form that never renders the stored value.