v0.3.38: billing cron job fix

[icecrasher321]

Summary

fix(billing): vercel cron not processing billing periods (#1112)

Type of Change

• Bug fix

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
sim (staging)	Ready		Comment	Aug 22, 2025 11:56pm

1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
docs	Skipped			Aug 22, 2025 11:56pm

[greptile-apps]

Greptile Summary

This PR fixes a critical authentication issue preventing Vercel's native cron jobs from executing billing processes. The core problem was that the existing authentication middleware only accepted Bearer token authentication, but Vercel cron jobs use a standard x-vercel-cron: 1 header instead of Authorization headers.

The changes modify the verifyCronAuth function in apps/sim/lib/auth/internal.ts to accept both authentication methods: the existing Bearer token approach for manual/external cron calls and the new Vercel cron header for Vercel's native cron system. This dual authentication approach maintains backward compatibility while enabling proper integration with Vercel's infrastructure.

Additionally, the daily billing endpoint (apps/sim/app/api/billing/daily/route.ts) was enhanced so that both GET and POST methods execute the actual billing processing logic (processDailyBillingCheck()), providing consistency and ensuring billing operations run regardless of the HTTP method used. A minor logging correction was also made to fix a misleading error message that incorrectly referenced 'monthly' instead of 'daily' billing.

These changes integrate with the existing authentication system shown in the codebase context, where the auth module handles various authentication methods and session management. The fix ensures that scheduled billing processes can execute properly in Vercel's serverless environment while maintaining security for other access patterns.

Confidence score: 4/5

• This PR addresses a specific authentication bug with a targeted solution that maintains backward compatibility
• Score reflects well-structured changes that follow established patterns but involves authentication logic that needs careful validation
• Pay close attention to the authentication bypass logic in apps/sim/lib/auth/internal.ts to ensure it doesn't create security vulnerabilities

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