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If you wish to save your Access token automatically when you login API hits in global variables and is available for every request. You can use below script.
Go in Scripts -> Post Request .. and add it.

// Ensure the API response contains the token
if (pm.response.code === 200) {
    // Parse the response body
    const responseBody = pm.response.json();

    // Assuming the token is in the response body under 'access_token'
    const accessToken = responseBody.data.accessToken;

    // Store the token in a Postman global variable
    pm.globals.set("Budget-Token", accessToken);

    // Optionally, log the stored token for confirmation
    console.log("Access Token saved to Postman globals:", accessToken);
} else {
    console.error("Failed to retrieve access token:", pm.response.text());
}