Who issues pyusd?

Could you elaborate on the issuer of pyusd? Who or what entity is responsible for its issuance? I'm curious to understand the background and the authority behind this cryptocurrency. Is it a centralized entity, a decentralized network, or perhaps a collaboration between multiple parties? What are the mechanisms and processes involved in the issuance of pyusd? And how does it ensure the stability and security of the currency? Clarifying these points would help us gain a deeper understanding of pyusd and its place in the cryptocurrency landscape.