Do you have two different installations of mautic running ? And you are trying to pass information from the one instance to the other ?
Firstly it looks like your web hook is not set up correctly, there is no endpoint, and if you are trying to pass this information you will need to send a web hook to the correct endpoint and catch it on the other side. You should look at the Mautic API documentation, TBH I am not sure you can send a web hook to the API, you may need to use something like zapier to do this if you are not to technical, if you are more technical inclined I would suggest using n8n.io. This way you can capture the web hook, process it and use an HTTP request to connect to the Mautic API