Webhooks

const crypto = require("crypto");

// The header looks like: x-ktb-signature: t=1699999999,v1=<hex hmac>
function verifySignature(rawBody, signatureHeader, webhookSecret) {
  const match = /^t=(\d+),v1=([a-f0-9]+)$/i.exec(signatureHeader.trim());
  if (!match) return false;
  const [, timestamp, provided] = match;

  // Reject stale signatures — protects against replayed deliveries.
  const ageSeconds = Math.abs(Math.floor(Date.now() / 1000) - Number(timestamp));
  if (ageSeconds > 5 * 60) return false;

  const signedPayload = `${timestamp}.${rawBody}`;
  const expected = crypto
    .createHmac("sha256", webhookSecret)
    .update(signedPayload)
    .digest("hex");

  const expectedBuf = Buffer.from(expected, "hex");
  const providedBuf = Buffer.from(provided, "hex");
  return (
    expectedBuf.length === providedBuf.length &&
    crypto.timingSafeEqual(expectedBuf, providedBuf)
  );
}

{
  "event": "job.succeeded",
  "jobId": "job_5f2a9d3e1b",
  "requestId": "req_9f3a1c2e4b",
  "post": {
    "title": "AI Content Marketing for Small Businesses: A Practical Starting Point",
    "slugSuggestion": "ai-content-marketing-small-business",
    "meta": {
      "description": "A practical guide to using AI content marketing as a small business, without losing the voice your customers already trust.",
      "primaryKeyword": "ai content marketing"
    },
    "outline": {
      "h1": "AI Content Marketing for Small Businesses: A Practical Starting Point",
      "h2": [
        "Why small businesses are turning to AI content marketing",
        "Where AI helps most, and where it doesn't",
        "Keeping your brand voice consistent",
        "A simple weekly workflow",
        "Frequently asked questions"
      ]
    },
    "sections": [
      {
        "type": "introduction",
        "contentMarkdown": "Most small business owners don't have a marketing department. AI content marketing tools promise to fill that gap, but the real question isn't whether AI can write — it's whether it can write like *you*."
      },
      {
        "type": "body",
        "heading": "Why small businesses are turning to AI content marketing",
        "contentMarkdown": "Small business SEO used to mean choosing between hiring a writer or falling behind. AI content marketing changes that math by making a consistent publishing schedule achievable without a full-time hire."
      },
      {
        "type": "body",
        "heading": "Where AI helps most, and where it doesn't",
        "contentMarkdown": "AI is strongest at first drafts, outlines, and repetitive formats like FAQs. It's weakest at judgment calls that depend on knowing your actual customers — so keep a human review step for anything customer-facing."
      },
      {
        "type": "callout",
        "contentMarkdown": "A five-minute voice check before publishing catches most AI-sounding phrasing.",
        "callout": {
          "label": "Quick tip",
          "text": "Read the draft aloud. If it doesn't sound like something you'd actually say to a customer, rewrite that line."
        }
      },
      {
        "type": "body",
        "heading": "Keeping your brand voice consistent",
        "contentMarkdown": "Give the tool a short brand voice brief once, then reuse it: three adjectives, one thing you never say, and one real customer question you hear often."
      },
      {
        "type": "body",
        "heading": "A simple weekly workflow",
        "contentMarkdown": "Draft on Monday, review and edit Tuesday, publish Wednesday. Keeping a fixed cadence matters more than any individual post."
      },
      {
        "type": "faq",
        "heading": "Frequently asked questions",
        "contentMarkdown": ""
      },
      {
        "type": "conclusion",
        "contentMarkdown": "AI content marketing works best as a drafting partner, not a replacement for judgment. Start with one post a week and keep your own voice in the final pass."
      }
    ],
    "faqs": [
      {
        "question": "Will AI-written content hurt my SEO?",
        "answer": "Search engines rank content on quality and usefulness, not on how it was drafted. Editing for accuracy and voice before publishing is what matters."
      },
      {
        "question": "How much editing does an AI draft usually need?",
        "answer": "Expect to adjust specific claims, add real examples from your business, and tighten anything that reads generic."
      }
    ],
    "conclusion": "AI content marketing works best as a drafting partner, not a replacement for judgment. Start with one post a week and keep your own voice in the final pass.",
    "coverageNotes": {
      "keywordCoverage": [
        {
          "keyword": "ai content marketing",
          "covered": true,
          "evidence": "Appears in title, H1, and introduction."
        },
        {
          "keyword": "small business seo",
          "covered": true,
          "evidence": "Appears in the second H2 section."
        }
      ]
    }
  },
  "rendered": {
    "markdown": "# AI Content Marketing for Small Businesses: A Practical Starting Point\n\nMost small business owners don't have a marketing department..."
  },
  "quality": {
    "status": "pass",
    "score": 91,
    "revisionCount": 0,
    "qualityVersion": "1.0.0"
  }
}

{
  "event": "job.failed",
  "jobId": "job_1a2b3c4d5e",
  "requestId": "req_2b3c4d5e6f",
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "constraints.maxWords exceeds the plan limit of 2000 words per request.",
    "details": {
      "field": "constraints.maxWords",
      "maxAllowed": 2000,
      "received": 5000
    }
  }
}