**Design a modern and responsive single page application interface for an online laboratory exam ordering system. The interface should include the following elements: 1. A clear header with the application's name and logo. 2. A list or grid of available exams, displaying the exam name, a brief description, and the price. Users should be able to select or deselect exams. 3. A summary section that shows the selected exams, the total number of exams chosen, and the total cost. 4. A secure payment section where users can enter their payment information, such as credit card details or PayPal credentials. This section should include input fields for the required information, as well as clear indicators of the security features in place. 5. A prominent "Submit Order" button for users to complete their purchase. 6. A simple navigation menu or instructions for users to return to the WhatsApp conversation after completing their order. The design should be clean, minimalist, and easy to use, with a color scheme that complements the laboratory's branding. Make sure the interface is accessible on both desktop and mobile devices.** - Image #1 <@248936796438659073>