fetchSnapshot.js

// I have stored the generated Mock URL as Collection Variable
let snapshotURL = pm.variables.get('snapshotURL'),
    
    /* Create the path that was used in actual request. We will send   it along with our Mock endpoint */
    path = pm.request.url.path.join('/');

/* If request contains any query params then pass those as well to    mock endpoint */
if (pm.request.url.query.count()) {
  
    let params = pm.request.url.query.map((q) => {
        return `${q.key}=${q.value}`;
    })
    
    path = `${path}?${params.join('&')}`;
}

// This is the final mock request that we will use.
let snapshotFetchOptions = {
    url: `${snapshotURL}/${path}`,
    method: pm.request.method
};

// Make a call to the Mock endpoint to fetch the Snapshot
pm.sendRequest(snapshotFetchOptions, function (err, res) {
    let snapshotResponse = res.json();
    if (err || snapshotResponse.error) {
        return;
    }
    
    pm.test.skip(`Response should match its saved Snapshot`, () => {
        //Match the API response with the snapshot response
        pm.expect(pm.response.json()).to.eql(snapshotResponse);
    });
    
});