Which specific Node Red solution are you referring to? If it’s using groovy, it’s from the old architecture, and all of that will go away by the end of this year. 
There’s also a community FAQ on edge if you haven’t heard about the new architecture yet
FAQ: I have no idea what Edge is. Is that a new developer tool? (2022)
In the New architecture, there are two ways to pass information back-and-forth to your smartthings account.
- if you have a smartthings/Aeotec hub, then you can use an edge driver from the “edge services“ category to communicate with your pi on the same LAN. For example, there’s an MQTT integration based on that structure.
You can find those by checking the quick browse list in the community-created wiki.
Quick Browse Lists for Edge Drivers - Things That Are Smart Wiki
- Alternatively, if you don’t have a hub or if you have some other reason for not wanting to use an edge service driver, you can use the rest API to communicate with the SmartThings cloud. But that’s a whole other project.
I haven’t seen a good Quickstart guide for this method, but you can check out the tutorials in the forum
