How to read live nodes values from OPC UA server?

I have searched inside the forum and found a Postman Collection which is provided by Macro Stoffel. This is the link. I tried to implement this collection.

I got a different response from the modified default REST API Postman Collection downloaded from your website. The response turned into empty. One thing I want to ask is what should I write here:
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What does the “s=TunableStatusCode” means here? It is different from nodeID? For example if I want to read the value of node: ns=2, i=2, what should I write there?