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How to Preserve Invoice PDFs as Immutable Evidence in Dispute Workflows

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A technical guide published on DEV Community outlines best practices for handling invoice PDFs during billing disputes in Node.js applications. The core advice warns against re-rendering old invoices using current templates, since factors like metadata, font subsets, and compression can silently alter file bytes even when output looks identical. Instead, developers are urged to store original PDF files alongside a SHA-256 hash, template version, fonts, and rendering tool details to create a verifiable evidence package. The guide provides TypeScript code that validates a stored PDF's hash before use and deliberately refuses to auto-correct any mismatch, treating byte-level changes as new facts requiring review. When originals are unavailable, reconstruction must be clearly labeled as such and kept strictly separate from verified original copies.

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