Security in custom software is not delivered by one plugin. Authentication, input validation, rate limiting, logging and secure configuration must work together.
Admin panel security
Passwords should never be stored in plain text, failed logins should be limited by IP and account, and sessions should expire after inactivity. Admin pages should be excluded from search engines and critical actions need CSRF protection.
Form and order protection
Contact and checkout forms require server-side validation. Honeypot fields, minimum completion time, request-size limits and IP-based rate limiting significantly reduce automated abuse. Prices must always be loaded from the trusted server-side product record.
Payment verification
Payment results should become final only after a signed server notification from the payment provider. The amount, currency and order identifier must be compared with the stored order, and mismatches should be moved to manual review.
Documents and private links
Order documents containing personal information should use unpredictable signed links and should only be downloadable for eligible order states. These endpoints need no-store caching and rate limits.
Maintenance and monitoring
Security logs should be reviewed, dependencies kept current and backups tested. Defense in depth is more reliable than depending on one control.