FoxyProxy VPN and proxy servers can be easily integrated with your website or app, transparently to your end-users. If you need batch or bulk service, we encourage you to contact us about custom plans or our reseller service, which includes a white-label option.
Code samples for proxy integration are here.
VPN integration is a little more difficult and depends heavily on the OS. We can provide code samples on request.
Here is our reseller API documentation.