Create HTTP POST endpoint for external service

@jonatandor35 I tried working with wiz-router but I am facing the basic problem. It accepts a GET request only. And, my payment service provider makes a POST request. So, with router, I am getting a 403 error.

Can I do something like this:
Use the Http function (which is working). And, in the response body, either do one of the following:

  1. Use an iframe and run a script inside to redirect the user.

  2. Show a small button which when clicked redirects the user to my URL.

I am not sure how can I integrate the button or the iframe inside the response body. Is it possible?