HTTP POSTing form data to 3rd party aspx API

It shouldn't be very difficult, but it will require a few lines of PHP and some patience. I am sure somebody here in the forums will be able to point you in the right direction.

We don't have examples of using SOAP or HTTP POST. So no, we don't have examples.

We only have examples of the available hooks and filters that Gravity Forms has.

To send data to a 3rd party you would have to use the gform_post_submission hook and write code to send the data to the 3rd party. The gform_post_submission hook has access to all of the field values from the entry that is created from the form. You can then write code to interact with the 3rd party service and send these values to that service.

We have Add-Ons that work with 3rd party services (MailChimp, Campaign Monitor, FreshBooks and PayPal) so you could also look at the code in those Add-Ons (if you have a Developer License) to see how to send data to a 3rd party.

Customizations are just that, customizations. You are responsible for the code. We can provide guidance and suggestions on which hooks to use and provide examples of how to use the hook but ultimately you would have to write the code for the customization.

Conditional redirects when submitting the form isn't a built in feature but it is a feature we plan on adding.

It is possible to do it now using the available tools. You would create your own PHP page that handles the redirect based on a query string value. You would then setup your form to redirect to that PHP page and pass the form field value. So while it's not a built in feature right now, Gravity Forms can easily be customized.

We do not do customizations or support customizations ourselves. If you want to integrate with a 3rd party service you would have to write the code yourself or hire a WordPress consultant with Gravity Forms experience to do so for you. We can refer you to a trusted developer with extensive Gravity Forms customization experience if thats the route you wanted to take.