title: Paypal, Recurring Billing, and ActiveMerchant
body: <p>I'm trying to research how to add a subscription based pay model on an existing site of mine, but am running into a lot of conflicting information and caused me to be a bit lost.</p>
  
  <p>All I need is a very simple way to set up recurring billing (per month) by credit card.  I just need a simple solution, but am having a hard time finding the best practices of setting it up.</p>
  
  <p>So far I understand that this is supported by Paypal's Website Payment Standards option. I just have a few questions regarding how I should implement it:</p>
  
  <ul>
  <li><p>First, does Paypal require a user to register for recurring billing with Website Payment Standard?</p></li>
  <li><p>I planned to use ActiveMerchant but I found some blogs that says ActiveMerchant doesn't support recurring billing from Paypal. is this true?</p></li>
  <li><p>I found the SASS Rails Kit by railskits.com, which says it supports recurring billing with Paypal's Website Payments Standard.  If I purchased this, would the code be clear enough to understand and implement in my own site, or is it kind of packaged deal for starter sites and not existing sites?</p></li>
  <li><p>I found a lot of blog with help with recurring billing with ActiveMerchant, but using Paypal's Express Checkout.  I read about Express Checkout on the Paypal site, but I still can't quite understand what it is, and how it's different from Website Payment Standard.  Can anyone explain this in a simple way?</p></li>
  </ul>
  
  <p>If anyone could answer even just one of these questions, I'd be very grateful!</p>
  
  <p>**By the way, before it gets suggested, I have watched all of Ryan Bates' Paypal screencasts about Paypal, which are great for basics or buying items in a shopping cart, but I don't understand how it should work with recurring billing.  Also, it seemed like he skipped some important steps in the video (e.g. the Paypal docs says after your app receives an IPN, you need to send back a confirmation of reception to Paypal, but Ryan does not do this in his screencast).  I'm just trying to make sense of all this!</p>