How can I get authorization for langgraph cloud remote deployment?

[edkesuma]

Hi, I already deployed my graph on Langgraph Platform. It has successfully deployed.
Below, I try to query the cloud instance from JS with fetch.

const response = await fetch(`${process.env.LANGGRAPH_CLOUD_URL}/threads/${threadId}/runs/${runId}`, {
      headers: {
        'Authorization': `${process.env.LANGCHAIN_API_KEY}`,
        'Content-Type': 'application/json'
      }
    });

However, it returns "Invalid token". I know that my langchain API key is already correct as I could test the langgraph cloud locally with the CLI tool and log it to the same account.

TLDR: Where can I get my authorization token?