Checkout Confirmation Flow - Copy this React, Tailwind Component to your project

Design a combined checkout and confirmation flow where, after the user selects a package and clicks 'Buy Now,' a confirmation popup appears with a summary of the purchase and a download link. Users should have a clear option to proceed with the payment. Implement a secure, user friendly payment form integrated into the popup. Ensure the design maintain the dark theme with white and yellow accents for a cohesive look and has responsive elements and subtle animations to guide users through the purchase and confirmation process seamlessly.