Blockchain Expert Needed for Crypto Payment System

I am launching a cryptocurrency payment system for retail stores where we have an dashboard for the store owner and a terminal connected to it. Think of it just like how you pay with the mastercard but you pay with crypto, The application and apk creatin i will handle later. Right now i just need help with the website. The project is nearly complete, with a functioning website and a sales-tracking dashboard. The website is written with Bolt.new AI and supabase. However, I require a seasoned blockchain professional to enhance the system.

Key Requirements:
- Simplified wallet management: Each retailer's account should be connected to custom wallets for major cryptocurrencies.
- Automated transaction tracking: All transactions should be automatically monitored and recorded.
- Integration with existing APIs: If there's an API that can simplify the process, it should be integrated.

Supported Cryptocurrencies:
- Bitcoin, Ethereum, Litecoin, and USDT across all major networks.

Security:
- Regular security audits to ensure transaction safety and system integrity.

Ideal candidates should possess:
- Extensive experience in blockchain technology and cryptocurrency.
- Skills in web development and API integration.
- A strong understanding of transactional security measures.

Please check the current website, create an account and explore the dashboard. Your expertise will be pivotal in bringing this project to fruition.