Splice JSON response

I'm getting an url in JSON response which I'm able to correlate. But in that url , a key is appended in the end which I need for execution of next API call. I'm stuck here as not able to splice from the output of JSON path extractor.

Use checks to extract what you need. Save the URL in one Session variable. Save the key that gets appended to another Session variable. In the follow-on request, use an expression to combine the two.