The frontend SDK performs three key functions at the moment:

- Fetching notifications from EPNS backend.

- Parsing fetched notifications.

- Rendering parsed notifications on mobile or in a browser

EPNS also includes a backend SDK written in TypeScript, which allows developers to construct the payload and send notifications based on individualized needs using custom logic — which provides additional flexibility beyond the EPNS dApp. With the relative newness of EPNS, I suspect many of the use cases for this backend customization have yet to be implemented.