Single-Item PHP Digital Shop

I’m building a small PHP site that sells just one digital product and need the core code put together. The focus is a smooth add-to-cart flow and a simple checkout that records the order and emails both the buyer and me. No full payment gateway is required right now; an order-confirmation step with secure download delivery is enough.

The storefront can stay minimal—one product page, a cart overlay or page, and a confirmation screen. I’ll supply copy and artwork; you handle the responsive HTML/CSS, vanilla PHP, and a touch of JavaScript for cart updates. Please keep the code framework-free, cleanly commented, and ready to drop onto a standard LAMP stack.

Deliverables
• Complete PHP/HTML/CSS/JS source files
• Lightweight admin config to change price, description, and replace the downloadable file
• Email template for order receipts
• Auto-generated, expiring download link after purchase
• Deployment notes for Apache/MySQL hosting

Acceptance Criteria
• Cart retains contents across navigation
• Order email reaches buyer and store owner with all details
• Download link works once and expires after set time or attempts
• Inputs sanitised and forms protected against CSRF

If you enjoy crafting precise, no-frills PHP solutions, this should be a quick win for both of us.