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 How does skipping a delivery affect my billing? How do I sign up Sezzle and create an account? I'd love to send you a handwritten letter, what is your corporate mailing address?