Developed a custom WordPress plugin that integrates Truffle Systems (Canada) POS with WooCommerce using secure API communication. The plugin imports subscribed POS menu items using POS ID and Branch ID, automatically syncing products, categories, pricing, and modifiers. It also customizes WooCommerce checkout to support pickup date and time selection, aligning online orders with restaurant workflows. All API interactions were tested using Postman, and the plugin was approved on WordPress.org. The solution is optimized, scalable, and ready for large marketplace integrations.