Troubleshooting Webhook Errors in Audioform Workflow

Hi, I am working on a flow that triggers a webhook through build.fillout which is a form where questions are asked and clients answer the questions via speech-to-text. We call it audioform. The answers to the questions are transcribed and sent to Lindy. But I am getting an error, and I will attach a photo as well as my webhook setup. It's saying I need a callback field, but I don't need to send anything back to fill it out; just send it to the next step in Lindy. Any help on this would be greatly appreciated. I'm not great with webhooks/coding lol Or if there's an easier way to accomplish this, I'm all ears.