Post form data to other page

Hi,
The redirect URL just does redirect and no data are posted. You may need to adjust the code of the web part and add the custom logic to read the submitted data and pass them to the external service you need.

There is a misunderstanding on Redirect property functionality. It should only redirect to different URL after a form is submitted and form data is inserted into database via control itself. If you want to post data to another page, easiest is to leverage an event handler from

https://docs.kentico.com/k11/custom-development/handling-global-events/reference-global-system-events#Reference-Globalsystemevents-BizFormItemEvents

And use a code like:

private void BizForm_Insert_After(object sender, BizFormItemEventArgs e)
    {
        string url = "google.com";

        var content = new StringContent(e.Item.ToString(), Encoding.UTF8);

        HttpClient client = new HttpClient();
        client.PostAsync(url, content);

    }