Fix Stripe webhook raw body handling

[cjo93]

Summary

• prevent JSON parsing from mutating Stripe webhook payloads so signature verification can succeed
• keep JSON parsing enabled for all non-webhook routes

Testing

• npm test -- --runInBand

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Codex Task

[gemini-code-assist]

Summary of Changes

Hello @cjo93, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical issue where the application's global JSON parsing middleware was inadvertently modifying Stripe webhook request bodies before signature verification could occur, leading to verification failures. The change introduces a conditional middleware that bypasses JSON parsing for the designated Stripe webhook endpoint, ensuring the raw request body is preserved for proper signature validation, thereby stabilizing webhook functionality without affecting other API routes.

Highlights

• Stripe Webhook Handling: Implemented a fix to prevent JSON parsing from mutating Stripe webhook payloads, which is crucial for successful signature verification.
• Conditional JSON Parsing: Modified the application's middleware to skip JSON parsing specifically for the Stripe webhook route (/api/payments/webhook), while retaining JSON parsing for all other non-webhook routes.

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[gemini-code-assist]

Code Review

This pull request fixes an issue with Stripe webhook signature verification by preventing the JSON body parser from consuming the raw request body for the webhook endpoint. The approach taken is to conditionally apply the express.json() middleware. While this works, I've left a comment suggesting a more robust, idiomatic Express.js solution that relies on middleware ordering to avoid hardcoding URL paths. This would improve the long-term maintainability of the code.