What is pay with Fio?

Could you elaborate on the concept of "Pay with Fio"? I'm curious to understand how it works and what makes it unique in the world of cryptocurrency and finance. Specifically, I'd like to know if it's a payment gateway, a digital wallet, or something entirely different. Furthermore, what benefits does it offer compared to other similar solutions? Does it support a wide range of cryptocurrencies, and what security measures are taken to protect user funds? Understanding the key features and advantages of "Pay with Fio" would help me determine if it's a viable option for my financial transactions.