Finish Landing Page with Crypto Payments

I already have the core design in place—an index.html file complete with animations and styling. I now need those assets turned into a polished, fully-functional 2- to 3-page landing-site and hooked up to a cryptocurrency-friendly payment gateway.

The job centres on two things:
1. Front-end refinement
• Extend the existing index into the remaining pages (about, checkout or similar).
• Preserve all current animations and responsiveness, tidying any rough edges so the site looks consistent across modern browsers and mobile.

2. Payment integration
• I’d like to accept “everything” listed in the prompt—Bitcoin, Ethereum, Litecoin—and, if possible, Paysafe. Feel free to recommend the best gateway (e.g. Coinbase Commerce, BitPay, or a comparable API) that can handle this mix.
• After integration, run a live sandbox test to confirm transactions flow and confirmation callbacks work.

Acceptance criteria
– All pages load fast and render correctly on mobile and desktop.
– Crypto checkout button shows real-time pricing and redirects back to a success page after payment.
– Transaction data is logged or emailed so I can verify orders.

Hand-off: deliver the updated code, a brief readme on how to change wallet addresses/keys, and any API credentials stored in env variables. I value clear commenting and clean file structure so I can maintain the site going forward.