duson-price-calculation

Printing price calculation combines base costs, design fees, and option adjustments from MySQL data sources via PHP APIs, generating a unified subtotal with VAT included for each product item.

AJAX price calculation sends product attributes from frontend JavaScript to PHP APIs, which query MySQL for base prices and return JSON results containing the subtotal, VAT, and final total for basket display.

VAT-aware subtotal computation supports nine print products including namecards, stickers, and envelopes, consolidating per-item base prices, design fees, and quantity adjustments into a single JSON API response.

Quantity-based price rules are handled by PHP logic that adjusts base prices and design fees according to product-specific parameters, applying VAT to generate the final total returned through AJAX JSON responses.

Frontend JavaScript AJAX calls communicate with PHP APIs to deliver real-time JSON price calculation results, enabling dynamic basket integration across all nine supported print product types.

VAT inclusion requires the PHP calculation logic to apply tax rules after composing base prices, design fees, and option costs; if VAT is missing, verify the MySQL data source contains the correct tax rates for each print item.