Add a webhook sample index.js

[hiroshinishio]

No description provided.

[sourcery-ai]

Hey @hiroshinishio - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding error handling for malformed events and unexpected event types
• Replace console.log statements with proper logging mechanism suitable for production

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[sourcery-ai]

suggestion: Consider adding error handling for unknown event types to avoid silent failures

The handler should explicitly handle cases where event.type doesn't match any known types, perhaps by throwing an error or returning an appropriate error response. This will make debugging easier and provide better visibility into invalid webhook calls.