Call Generate Url api with valid parameter define above. and In Response, in success case encdata and Url will received .
You have to auto redirect POST form to response url with encdata field having response value

<form method="post" action="URL received from generate url API">
  <textarea name="encdata" style="display:none">value received from generate url API</textarea>
  <input type="submit" value="Submit">

After the process is completed check the redirect URL you are getting the encrypted data, you need to decrypt that data using JWT key.

Click Try It! to start a request and see the response here!