There is a common question: - “Is it possible to redirect using a POST method?”
And the answer is: - “Redirection isn’t possible with POST requests - it’s part of the HTTP/1.1 protocol”.

To perform the request with POST params, need to introduce another step that contains the form data, so you need additional view in your flow.

To simplify that you can use a specific gem Repost which will generate hidden step with needed form data under the hood.