DOKU is externally audited every year by Control Case (QSA), which has certified us at Level 1 PCI DSS (Payment Card Industry Data Security Standards) compliant. PCI DSS is the most stringent criteria established by the industry to safeguard client data and to protect payment integrity. This certification assures that DOKU adheres to the highest security standards, and your payments are always in compliance when using DOKU. This certification helps DOKU to prevent credit card fraud, hacking and other security issues. The PCI DSS certification is mandatory for a company to process, store or transmit credit card numbers.