Post-Purchase HTML/CSS Upsell Pages

I need two eye-catching, conversion-focused HTML pages that appear immediately after a customer completes payment in my eCommerce SaaS platform. Page one introduces our “Set-Up & Configuration Service,” spotlighting the limited-time $299 price (regularly $1,999)... (Budget: $30 - $250 USD, Jobs: Conversion Rate Optimization, CSS, eCommerce, Graphic Design, HTML, UI / User Interface, Web Design, Website Design)