The portal orders that the signature process be executed via the browser.
The URL to which the browser is redirected must be extracted from the JSON response from the previous operation i.e. creation of document signature process. Specifically, the redirect URL is extracted from the URL field of the only element currently contained in the tasks.pending array of a recently created signature process (an element whose type is always UserBrowserTask). The execution of the signature process of a document is finished by sending a redirect response to the application/portal browser with which the user requested the signature.