title: Developing shopping web app
body: <p>What web software systems of frameworks are necessary to develop a web application that has catalog of products and allows them to be buyed, using shopping cart and payment methods like, paypal, debit cards, credit cards etc... </p>
  
  <p>The technology I am asking is php.</p>
  
  <p>For example If I am developing system like this, can I finish the job using only Drupal or Joomla? What other subsystems should be added? Can someone give me examples? Or maybe using some CRM system?</p>
  
  <p>I prefer opensource soulutions. </p>