What Blockchain is Paribus on?

Excuse me, could you please clarify for me which blockchain platform Paribus is built upon? I understand that Paribus is a platform that helps users save money by automatically filing price protection claims with retailers, but I'm curious about the underlying technology that supports it. Is it built on a popular blockchain network like Ethereum or Bitcoin, or is it a proprietary blockchain designed specifically for Paribus? I'd appreciate any information you could provide to help me better understand the technological foundation of this platform.