As we all know, snapchat that usually used for basic conversation and posting stuff links snaps, and video content.
On the other hand, Premium Snapchat is a platform where content shared by users can only be viewed by those who pay for access. It is also known as Private snap.
People who want to sell private stuff, such as images, and videos, that almost usually take the form of explicit content, use premium Snapchat. You can use a third-party app to accept payment from users who want quick access to your snaps. The majority of Premium Snapchat is either subscription-based or provided as lifetime access with a one-time purchase.
Source:https://getassist.net/snapchat-premium/