- Implemented uploadProofOfPayment function for per-bill proof of payment
- Validates file size using MAX_PROOF_OF_PAYMENT_UPLOAD_SIZE_KB env variable
- Validates PDF file type
- Prevents duplicate uploads with existence check
- Uses optimized database projection to minimize data transfer
- Updates specific bill using MongoDB array filters
- Refactored file validation in updateOrAddBill
- Moved validation before serialization for fail-fast behavior
- Added configurable file size limit from environment variable
- Added PDF type validation
- Improved error messages with specific validation failures
- Updated serializeAttachment function
- Changed return type from BillAttachment to FileAttachment
- Added uploadedAt timestamp to attachment object
- Removed unsafe type cast
- Code formatting improvements throughout
- Consistent spacing and indentation
- Better TypeScript typing
This completes the per-bill proof of payment feature implementation.
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Co-Authored-By: Claude <noreply@anthropic.com>
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