title: Heroku and ip mask
body: <p>I'm building a shopping site which uses a service which allows credit card payments (tranzilla), the service is requiring an IP or IP mask from which it will allow requests (by sockets). The problem is that I'm using heroku as hosting, which is decentralized...
  Is there any way to do this? (except buying the custom ssl add-on, which is my last resort and not the best solution)<br>
  P.S. full IP mask is not acceptable.</p>