What is PSP rate?

Could you please explain what exactly is meant by the term "PSP rate"? Is it a specific financial term related to cryptocurrency or finance in general? I'm interested in understanding how it's calculated, its significance, and what factors influence its value. Additionally, are there any specific industries or scenarios where the PSP rate is particularly relevant? Understanding the PSP rate would definitely help me in my professional endeavors, so I'd appreciate your clarification.