pull down to refresh

Of course! It's an open protocol that was initially developed by Lightning Labs and is currently being standardized as a BLIP
You can find the BLIP details here: https://github.com/lightning/blips/pull/26
There are already several libraries and websites that have implemented this protocol. I've compiled a list of awesome resources related to L402 on this GitHub repo:
If you encounter any issues while integrating L402 into your project, feel free to open an issue on that repo, and the community will be happy to help you out!