Feat/issues950#1070
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Closes #950
created both files:
✅ paystack-webhook.util.ts:
verifyPaystackSignature(rawBody, signature, secret): boolean
Uses crypto.createHmac('sha512', secret).update(rawBody).digest('hex')
Compares using crypto.timingSafeEqual for constant-time comparison (prevents timing attacks)
Returns false (doesn't throw) on signature mismatch
Returns false if signature or secret is empty
Gracefully handles errors (e.g., invalid hex)
Closes #951