feat(webhook): frescor opcional (anti-replay) em verify_webhook_signature - #1
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…y_webhook_signature Novo parâmetro opcional `tolerance_seconds`: após validar o HMAC, rejeita entregas cujo `sentAt` (no corpo assinado) esteja fora da janela. Aditivo e retrocompatível (sem o param, comportamento idêntico). Pareado com o backend, que agora assina `id` + `sentAt`; deduplique por `id` para idempotência. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Contexto
Parte da remediação do webhook de saída (achado F13 da auditoria da API). A assinatura HMAC prova autenticidade, não frescor — uma entrega assinada capturada poderia ser reenviada (replay). O backend agora assina
id(UUID) +sentAtno corpo; este PR dá ao SDK a primitiva para o receptor rejeitar entregas obsoletas.Novo parâmetro opcional
tolerance_seconds: valida a assinatura e, se informado, exige quesentAtesteja dentro da janela.Retrocompatível: sem o parâmetro/tolerância, o comportamento é idêntico. A computação do HMAC não mudou → golden vector permanece válido. Deduplicar por
id(no corpo) continua a cargo do receptor.Follow-up
Parte de um conjunto de PRs paralelos (Node/Python/Go/PHP) para paridade.
🤖 Generated with Claude Code