Hi, Joachim

Firstly, I would like to sincerely apologize for the delayed response as we have been experiencing an unusually high number of tickets. I am sorry that it has taken longer than usual to respond to your concern and your patience is highly appreciated.

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To redirect someone before they click on "Finish",  it requires a custom workaround.

We don't have a built-in feature for it yet, but you can suggest it on this page.

At this time, you can try to use hooks like "beforeConfirmedBooking", for example, that will be triggered when your customers confirm the booking. 

You can set the redirect URL that you need like in this script (we use https://www.google.com as an example, but you will replace it with your own URL):

<script>
window.beforeConfirmedBooking = function()
{
window.location.href = "https://www.google.com";
};
</script>

Please insert this script on the footer of the page where you insert Amelia's shortcode.

Custom code needs to be applied to the page where the booking form is. Depending on what you're using (Gutenberg blocks, or some page builder), adding the CSS or JS can be done in a few different ways. 

If you need help with adding custom JS to the page, please take a look at this article.

I hope it helps.