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Create a Reply webhook; its signing secret is returned once

Save an HTTPS endpoint with a generic, Grok, or Slack payload preset. Pass its whk_ ID as webhookId when creating a prompt, set a service's defaultReplyWebhookId, or set isDefault:true for account replies including MCP/API prompts without services. Account and selected endpoints each receive one event, deduplicated by endpoint ID. Store the signingSecret securely to verify signed deliveries.

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