ShieldScan is a security auditing app that scans your Shopify store across six attack surfaces and delivers an instant letter-grade report with clear, actionable fixes. It detects injected malware and credit-card skimmers in your theme code, flags apps with excessive OAuth permissions, inspects every third-party script running on your storefront, and verifies your HTTP security headers. Each scan produces a security score out of 100, a plain-English summary of every issue found, and step-by-step