Cryptocurrency Cash-Out Integration

I need assistance to cash out my Bitcoin (BTC) from a custom-built horse race betting website.

Requirements:
- Understand how to interface with custom-built websites.
- Experience with cryptocurrency transactions, especially Bitcoin.
- Ability to ensure secure and efficient cash-out process.

Ideal skills include:
- Web development proficiency (especially in custom platforms).
- Knowledge of cryptocurrency wallets and exchanges.
- Security best practices in handling crypto transactions.