NF525 is a French certification confirming that point-of-sale software meets the four requirements known as ISCA: Inalterability, Security, Conservation (retention) and Archiving of payment data.
Since 1st January 2018, article 286-I-3 bis of the French General Tax Code has required VAT-liable businesses that record their customers' payments through point-of-sale software to use secured software. Compliance can be demonstrated through a certificate (NF525, LNE) or through an individual statement issued by the software publisher.
In practice, compliant software makes every receipt immutable (often through a hash chain and a signature), keeps a tamper-proof event log, and produces closing reports (daily, monthly, annual) that are retained over time.
eyeot's point-of-sale module meets these obligations: receipts chained with SHA-256, a permanent fiscal journal, Z/G/M/A closing reports and a publisher's statement compliant with the 2026 French Finance Act.