I want a lightweight WordPress plugin that lets anyone visiting the site confirm the authenticity of our educational certificates by typing a unique code into a simple form. When the code is valid, the plugin should instantly display the graduate’s name, program, graduation date, and an optional PDF download of the certificate; if the code is invalid, it should return a clear error message. Core flow • In the back-end I need an admin screen where staff can add, edit, bulk-import, or deactivate certificate records (CSV upload is fine). • On the front-end a shortcode or Gutenberg block should render the verification box so I can drop it onto any page. The form must be public-facing—no login required. • All data has to live in its own custom database table (not mixed with posts) for speed and easy export. • Security is critical: sanitize inputs, use prepared SQL, and disable direct file access. No unnecessary libraries. • The UI should follow our existing theme styles or at least be easily overridable with CSS. Deliverables 1. Fully documented plugin folder ready for installation. 2. SQL script (or built-in installer) that creates the certificate table. 3. Brief setup guide explaining how to import certificates and place the verifier on a page. 4. One round of bug-fix support after delivery. Please stick to WordPress coding standards and keep the code clean so future updates are straightforward.