Is Sezzle secure? March 31, 2021 04:07 Updated Your security is of utmost importance to us too! Sezzle undergos quarterly scans and yearly audits to ensure your data is safely stored in our systems – and to maintain compliance at the highest level in the Payment Card Industry (PCI): PCI Level 1. Related articles Does Sezzle hurt my credit score? How do I contact Sezzle’s customer service?